{"title":"Clearance Parts - Mail Order Tuner","description":"\u003cdiv class=\"shogun-root\" data-shogun-id=\"60bfdd1bd1520000f3eaa9b6\" data-shogun-site-id=\"ba8c7c8a-e64a-43bc-9a69-6425d926076e\" data-shogun-page-id=\"60bfdd1bd1520000f3eaa9b6\" data-shogun-page-version-id=\"60bfdd1bd1520000f3eaa9b5\" data-shogun-platform-type=\"shopify\" data-shogun-variant-id=\"60bfdd1bd1520000f3eaa9b7\" data-region=\"main\"\u003e\n  \n\n\u003cdiv id=\"s-fdc88478-4fde-4650-90dd-f57c9f056ad8\" class=\"shg-c  \"\u003e\n  \n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n","products":[{"product_id":"gm-ls7-lifter-set-mailordertuner","title":"GM LS7 Lifter Set - MailOrderTuner","description":"\u003cp style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; color: #555555; font-family: inherit; font-size: 100%; font-style: inherit; font-variant: normal; font-weight: inherit; letter-spacing: normal; line-height: 1.3em; orphans: 2; outline-color: invert; outline-style: none; outline-width: 0px; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; vertical-align: baseline; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px; padding: 0px; margin: 0px; border: 0px none currentColor;\"\u003e\u003cstrong style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; font-family: inherit; font-size: 100%; font-style: inherit; font-weight: inherit; outline-color: invert; outline-style: none; outline-width: 0px; text-decoration: none; vertical-align: baseline; padding: 0px; margin: 0px; border: 0px none currentColor;\"\u003e\u003cspan style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; color: #ff0000; font-family: inherit; font-size: 18px; font-style: inherit; font-weight: inherit; outline-color: invert; outline-style: none; outline-width: 0px; text-decoration: none; vertical-align: baseline; padding: 0px; margin: 0px; border: 0px none currentColor;\" mce-data-marked=\"1\"\u003eIN STOCK \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cspan style=\"display: inline !important; float: none; background-color: #ffffff; color: #555555; font-family: inherit; font-size: 100%; font-style: inherit; font-variant: normal; font-weight: inherit; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;\"\u003e \u003c\/span\u003e\n\u003cdiv class=\"panel\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"panel\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003eNO MANUFACTURER WARRANTY ON THIS PRODUCT\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eGM\/Delphi LS7 style replacement stock lifters for all LS engines without active fuel management!  These lifters are the replacement part for anyone looking to upgrade their LS engine with a new set of GM lifters.  They are also a great option for those wanting to remove the factory AFM\/DOD lifters from their L76, L99, or gen 5 LT1 engine. These lifters have several upgrades that make them a perfect addition to your LS or gen 5 LT1 build.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e*Non-DOD Applications Only\u003c\/p\u003e\n\u003cdiv class=\"ProductWarnings\"\u003e\n\u003cdiv class=\"Warning_prop-65\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cscript\u003e\nvar acc = document.getElementsByClassName(\"accordion\");\nvar i;\n\nfor (i = 0; i \u003c acc.length; i++) {\nacc[i].onclick = function() {\nthis.classList.toggle(\"active\");\nvar panel = this.nextElementSibling;\nif (panel.style.maxHeight){\npanel.style.maxHeight = null;\n} else {\npanel.style.maxHeight = panel.scrollHeight + \"px\";\n}\n}\n}\n\u003c\/script\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":29402533232739,"sku":"","price":210.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/products\/ls7_lifterspics.jpg?v=1621793767"},{"product_id":"gm-ls7-lifters-and-ls2-ls3-ls7-l98-lifter-tray-mailordertuner","title":"GM LS7 Lifters and LS2\/LS3\/LS7\/L98 Lifter Tray  - MailOrderTuner","description":"\u003cp style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; color: #555555; font-family: inherit; font-size: 100%; font-style: inherit; font-variant: normal; font-weight: inherit; letter-spacing: normal; line-height: 1.3em; orphans: 2; outline-color: invert; outline-style: none; outline-width: 0px; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; vertical-align: baseline; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px; padding: 0px; margin: 0px; border: 0px none currentColor;\"\u003e\u003cstrong style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; font-family: inherit; font-size: 100%; font-style: inherit; font-weight: inherit; outline-color: invert; outline-style: none; outline-width: 0px; text-decoration: none; vertical-align: baseline; padding: 0px; margin: 0px; border: 0px none currentColor;\"\u003e\u003cspan style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; color: #ff0000; font-family: inherit; font-size: 18px; font-style: inherit; font-weight: inherit; outline-color: invert; outline-style: none; outline-width: 0px; text-decoration: none; vertical-align: baseline; padding: 0px; margin: 0px; border: 0px none currentColor;\" mce-data-marked=\"1\"\u003eIN STOCK \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cspan style=\"display: inline !important; float: none; background-color: #ffffff; color: #555555; font-family: inherit; font-size: 100%; font-style: inherit; font-variant: normal; font-weight: inherit; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;\"\u003e \u003c\/span\u003e\n\u003cp style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; color: #555555; font-family: inherit; font-size: 100%; font-style: inherit; font-variant: normal; font-weight: inherit; letter-spacing: normal; line-height: 1.3em; orphans: 2; outline-color: invert; outline-style: none; outline-width: 0px; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; vertical-align: baseline; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px; padding: 1em 0px 0px 0px; margin: 0px; border: 0px none currentColor;\"\u003e\u003cbr style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; outline-color: invert; outline-style: none; outline-width: 0px; text-decoration: none; padding: 0px; margin: 0px; border: 0px none currentColor;\"\u003e \u003cspan style=\"border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; font-family: Arial; font-size: 14px; font-style: inherit; font-weight: inherit; outline-color: invert; outline-style: none; outline-width: 0px; text-decoration: none; vertical-align: baseline; padding: 0px; margin: 0px; border: 0px none currentColor;\"\u003e Chevrolet Performance LS7 lifter set is an OE hydraulic roller lifter that can be used in all non-DOD LS and Gen 5 LT engines.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center; font-size: 27px;\"\u003e\u003cstrong\u003eLS7 Lifters – (FAQ’s) Frequently Asked Questions\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv id=\"section2\" class=\"accordion\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"content\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbutton class=\"accordion\"\u003eGenuine GM Performance LS7 Lifters Set\u003c\/button\u003e\n\u003cdiv class=\"panel\"\u003e\n\u003cp\u003eMail Order tuner proudly supplies the natural LS7 lifters for LS engines. These lifters are the perfect replacement of the standard lifters known to start as noisy- Often with a sound and evolve into much more of an issue. LS7 lifters prevent damaging the hydraulic camshaft and causing expensive labour and help save our time and headaches with other filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cbutton class=\"accordion\"\u003eWhat is the need for LS7 Lifters?\u003c\/button\u003e\n\u003cdiv class=\"panel\"\u003eLifters in factories are loaded with springs, and the problem occurs in these loaded lifters and is famous for failing and crucially eating away the camshaft. This can lead to severe problems that can easily be prevented by upgrading the LS7 lifters. These wrong locations and preload result in open values, and therefore this leads to loss of power. These filters are designed to replace the standard filters and will surely suit all LD engines in your factory. We assure you that all our products are manufactured with high-quality material on which you can trust the reliability and performance of the LS-powered vehicle.\u003c\/div\u003e\n\u003cdiv class=\"panel\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"panel\"\u003eThis is a complete set of 4 Lifter Trays\u003c\/div\u003e\n\u003cdiv class=\"panel\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eGM LS2 lifter tray. OE replacement part designed to hold the lifters in place.  These can also be a direct replacement in the Gen-3 engine blocks (i.e. LS1, LS6, LQ9, etc.).\u003c\/span\u003e\u003c\/div\u003e\n\u003cscript\u003e\nvar acc = document.getElementsByClassName(\"accordion\");\nvar i;\n\nfor (i = 0; i \u003c acc.length; i++) {\nacc[i].onclick = function() {\nthis.classList.toggle(\"active\");\nvar panel = this.nextElementSibling;\nif (panel.style.maxHeight){\npanel.style.maxHeight = null;\n} else {\npanel.style.maxHeight = panel.scrollHeight + \"px\";\n}\n}\n}\n\u003c\/script\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":39742571905123,"sku":"","price":255.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/products\/ls7_lifterspics_bb496ecc-c455-4109-8005-cf7104836570.jpg?v=1644348660"},{"product_id":"btr-truck-norris-camshaft","title":"BTR TRUCK NORRIS Camshaft","description":"\u003cp\u003eBTR Gen 3 and Gen 4 LS Truck Norris Camshaft \u003c\/p\u003e\n\u003cp\u003e212\/22X .552\/.552 107 LSA \u003c\/p\u003e\n\u003cul class=\"a-unordered-list a-vertical a-spacing-mini\"\u003e\n\u003cli\u003e\u003cspan class=\"a-list-item\"\u003eThe Truck Norris will deliver a roundhouse kick in the pants to your 1999-2013 GM V8 Truck or SUV! Developed from hundreds of hours of in-house cam lobe design and dyno testing, this camshaft has more power and torque everywhere in the curve compared to BTR's legendary V2 truck cams. It has an idle sound similar to more aggressive truck camshafts, yet will behave well with stock torque converters.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BTR","offers":[{"title":"Default Title","offer_id":40007814578275,"sku":"BTR-TRUCK NORRIS","price":409.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/products\/BTRcam.jpg?v=1661267342"},{"product_id":"2014-chevrolet-silverado-1500-l83-5-3l-dod-delete-kit-w-camshaft-for-2014-2018-gm-models","title":"2014 Chevrolet Silverado 1500 L83 5.3L Dod Delete Kit w\/ Camshaft For 2014-2018 GM Models","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis kit includes everything needed to delete AFM\/DOD (Active Fuel Management) from GM L83, LT1\/L86 Dod Delete Kit w\/ Camshaft.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTUNING REQUIRED\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis Kit Includes The Following:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDOD Hole Plug\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e2014+ LT1 Head Bolt Kit\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eGM\/Delphi LS7 Style Lifter, Set of 16\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTSP OE Style Gen 5 5.3 Head Gasket (Each)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e2014+ LT1 Stingray Valley Cover Gasket\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGM LS1\/LS6\/LT1 Wet Sump Balancer Bolt\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLT1 Stingray Exhaust Manifold Gasket Each\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eGM LT1 \u0026amp; 2014-2018 L83\/L86 Cam Phaser Bolt \/ Valve\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTSP OEM-Style Non-DOD Camshaft\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTSP LS\/LT Front Crank Seal \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGM LS3 Lifter Trays - Set of 4\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWater Pump Gasket 2014+ LT1\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":47720210694445,"sku":"25-DODBASIC","price":918.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/files\/18933_7504987a-53f7-4381-a3dc-756b6c7d9e62.png?v=1727274770"},{"product_id":"l84-5-3-dod-delete-kit-w-camshaft-for-2019-25-gm-trucks","title":"L84 5.3 Dod Delete Kit w\/ Camshaft For 2019-25 GM Trucks","description":"\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e2019+ DOD Hole Plugs\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2014+ LT1 Head Bolt Kit\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGM\/Delphi LS7 Style Lifters\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Set of 16)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTSP OE Style Gen 5 5.3 Head Gasket\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Each)\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2014+ LT1 Stingray Valley Cover Gasket\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eGM LS1\/LS6\/LT1 Wet Sump Balancer Bolt\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLT1 Stingray Exhaust Manifold Gasket\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Each)\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eGM LT 2019+ Cam Phaser Bolt \/ Valve\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTSP OEM-Style Non-DOD Camshaft\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTSP LS\/LT Front Crank Seal\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGM LS3 Lifter Trays\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Set of 4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Pump Gasket\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(2014+ LT1)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":51542986228013,"sku":"25-DODBASIC","price":826.89,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/files\/18933_7504987a-53f7-4381-a3dc-756b6c7d9e62.png?v=1727274770"},{"product_id":"l84-6-2-dod-delete-kit-w-camshaft-for-2019-25-gm-trucks","title":"L84 6.2 Dod Delete Kit w\/ 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Heads","description":"\u003ch2\u003eMangum Racing 273cc Qualcast LS7 Cylinder Heads\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eMangum Racing CNC Ported 273 LS7 Cylinder Heads\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eBuilt from the Qualcast stock style replacement LS7 casting, the Mangum Racing 273 program is designed for high-rpm, large-displacement LS combinations that demand elite airflow and structural integrity.\u003c\/p\u003e\n\u003cp\u003eFeaturing a 12° valve angle and OEM LS7 valve spacing\/valve length, this 6-bolt casting delivers exceptional port efficiency while maintaining compatibility with LS7-based platforms. With a 273cc CNC intake runner and optimized 93cc exhaust port, this cylinder head is engineered for serious naturally aspirated builds and high-output boosted applications where the customer wants a near bolt on cylinder head.\u003c\/p\u003e\n\u003cp\u003eEach set is fully CNC machined in-house on our Centroid 5-axis machining centers and finished on Newen seat and guide equipment. Every head is hand blended, assembled, and inspected in small batches to ensure dimensional accuracy and repeatable performance.\u003c\/p\u003e\n\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\n\u003cp\u003eTested on a SuperFlow 1020 with a 4.125” bore plate\u003c\/p\u003e\n\u003cp\u003eIntake (Radius Entry)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 160 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 255 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 311 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 352 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 380 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 390 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExhaust (No Pipe)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 117 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 160 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 209 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 221 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 230 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 244 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 273 LS7 delivers outstanding mid-lift efficiency with dominant high-lift airflow, making it ideal for aggressive street \/ strip combinations.\u003c\/p\u003e\n\u003ch3\u003ePremium Hardware \u0026amp; Construction\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e6-bolt Qualcast LS7 casting\u003c\/li\u003e\n\u003cli\u003e12° valve angle with OEM LS7 valve spacing\u003c\/li\u003e\n\u003cli\u003eStock Valve Lengths\u003c\/li\u003e\n\u003cli\u003e273cc CNC intake port\u003c\/li\u003e\n\u003cli\u003e93cc exhaust port\u003c\/li\u003e\n\u003cli\u003e70.5cc CNC combustion chambers (milling available at no charge)\u003c\/li\u003e\n\u003cli\u003e2.200” titanium intake valves\u003c\/li\u003e\n\u003cli\u003e1.610” stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze CHE guides\u003c\/li\u003e\n\u003cli\u003ePAC .660” dual spring package\u003c\/li\u003e\n\u003cli\u003eTitanium retainers\u003c\/li\u003e\n\u003cli\u003eViton seals\u003c\/li\u003e\n\u003cli\u003e1.250” steel spring seats\u003c\/li\u003e\n\u003cli\u003eChamber softening available\u003c\/li\u003e\n\u003cli\u003eFlat milling at .006” per cc\u003c\/li\u003e\n\u003cli\u003eMinimum bore: 4.100”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDesigned for LS7 Street \u0026amp; Strip Builds\u003c\/h3\u003e\n\u003cp\u003eWith airflow over 390 CFM at .700” lift, the Mangum Racing 273 LS7 is capable of supporting serious naturally aspirated horsepower in 427+ cubic inch combinations.\u003c\/p\u003e\n\u003cp\u003eStock pushrod length works in many applications but should always be verified based on camshaft selection and final milling.\u003c\/p\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":51841259864365,"sku":"MR-273LS7","price":3299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/files\/MR-273LS7.webp?v=1771882249"},{"product_id":"mangum-racing-267cc-ls3-cylinder-head","title":"Mangum Racing 267cc LS3 Cylinder Head","description":"\u003ch2\u003eMangum Racing 267cc LS3 Cylinder Heads\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eMangum Racing CNC Ported MR 15° LS3 Cylinder Heads\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eBuilt from our 6-bolt 15° LS3 casting featuring increased deck thickness, the MR 15° LS3 is engineered for serious naturally aspirated and boosted combinations that demand airflow, strength, and repeatability — while maintaining OEM valve angle and valve location geometry.\u003c\/p\u003e\n\u003cp\u003eThis casting is designed to support\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e1,500+ horsepower\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003ecombinations when paired with the proper short block and induction system, making it an ideal solution for builders who need maximum performance without moving away from stock valve layout.\u003c\/p\u003e\n\u003cp\u003eEach set is fully CNC ported in-house on new Centroid 5-axis machining centers and finished on Newen seat and guide equipment. Every cylinder head is hand blended, inspected, and assembled in small batches to ensure dimensional accuracy and consistency.\u003c\/p\u003e\n\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\n\u003cp\u003eTested on a SuperFlow bench with a 4.125” bore plate\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIntake (Radius Entry)\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 148 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 227 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 282 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 325 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 350 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 363 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eExhaust (No Pipe)\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 114 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 164 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 200 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 233 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 240 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 243 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWith a 267cc CNC intake runner and optimized 96cc exhaust port, the MR 15° delivers strong mid-lift efficiency and stable high-lift airflow — ideal for aggressive hydraulic roller and race-oriented camshaft profiles while retaining factory valve geometry.\u003c\/p\u003e\n\u003ch3\u003ePremium Hardware \u0026amp; Construction\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e6-bolt Mangum Racing LS3 casting with increased deck thickness\u003c\/li\u003e\n\u003cli\u003e15° valve angle with OEM LS3 valve spacing\u003c\/li\u003e\n\u003cli\u003e2.165” hollow stem stainless intake valves\u003c\/li\u003e\n\u003cli\u003e1.600” hollow stem stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze guides\u003c\/li\u003e\n\u003cli\u003ePAC .660” dual spring package\u003c\/li\u003e\n\u003cli\u003eTitanium retainers\u003c\/li\u003e\n\u003cli\u003eViton seals\u003c\/li\u003e\n\u003cli\u003e1.250” steel spring seats\u003c\/li\u003e\n\u003cli\u003e68.5cc CNC chambers (milling available at no charge)\u003c\/li\u003e\n\u003cli\u003eChamber softening options for 4.000”, 4.065”, and 4.125” bore sizes\u003c\/li\u003e\n\u003cli\u003eFlat milling at .006” per cc\u003c\/li\u003e\n\u003cli\u003eMinimum bore: 4.000”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBuilt for High-Output Stock-Geometry Combinations\u003c\/h3\u003e\n\u003cp\u003eThe increased deck thickness provides added durability under elevated cylinder pressure, while the 15° valve angle maintains compatibility with stock-style piston valve reliefs and factory-based valvetrain geometry.\u003c\/p\u003e\n\u003cp\u003eThe PAC .660” dual spring system offers the stability required for serious street or race camshaft profiles, and stock pushrod length works in many applications (final length should always be verified based on camshaft and milling).\u003c\/p\u003e\n\u003cp\u003eFor builders who need to retain OEM valve angles and locations but demand serious airflow capability, the MR 15° LS3 casting delivers.\u003c\/p\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":51841265697069,"sku":"MR-267LS3","price":2099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/files\/MR-267LS3.webp?v=1771882493"},{"product_id":"mangum-racing-brodix-267cc-ls3-cylinder-heads","title":"Mangum Racing Brodix 267cc LS3 Cylinder Heads","description":"\u003ch2\u003eMangum Racing Brodix 267cc LS3 Cylinder Heads\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eMangum Racing CNC Ported Brodix 15° LS3 Cylinder Heads\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eBuilt from Brodix 6-bolt LS3 castings with extra deck thickness, our Mangum Racing 15° LS3 heads are designed for serious naturally aspirated and boosted combinations that demand airflow, strength, and repeatability.\u003c\/p\u003e\n\u003cp\u003eEach set is fully CNC ported in-house with brand new Centroid 5-axis CNC mills and Newen seat \u0026amp; guide machines. Every set of cylinder heads is hand blended and carefully inspected before final assembly to ensure dimensional accuracy and consistency.\u003c\/p\u003e\n\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\n\u003cp\u003e(4.125” Bore Plate)\u003c\/p\u003e\n\u003cp\u003eIntake (Radius Entry)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 148 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 227 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 282 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 325 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 350 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 363 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExhaust (No Pipe)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 114 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 164 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 200 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 233 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 240 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 243 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWith a 267cc CNC intake runner and optimized 96cc exhaust port, these heads deliver strong mid-lift numbers with excellent high-lift stability — making them ideal for aggressive hydraulic roller street \u0026amp; race builds needing to retain the stock valve locations \u0026amp; angles.\u003c\/p\u003e\n\u003ch3\u003ePremium Hardware \u0026amp; Construction\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e6-bolt Brodix LS3 casting with increased deck thickness\u003c\/li\u003e\n\u003cli\u003e15° valve angle, OEM LS3 valve spacing\u003c\/li\u003e\n\u003cli\u003e2.165” hollow stem stainless intake valves\u003c\/li\u003e\n\u003cli\u003e1.600” hollow stem stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze guides\u003c\/li\u003e\n\u003cli\u003ePAC .660” dual spring package\u003c\/li\u003e\n\u003cli\u003eTitanium retainers\u003c\/li\u003e\n\u003cli\u003eViton seals\u003c\/li\u003e\n\u003cli\u003e1.250” steel spring seats\u003c\/li\u003e\n\u003cli\u003e68.5cc CNC chambers (milling available at no charge)\u003c\/li\u003e\n\u003cli\u003eChamber softening options for 4.000”, 4.065”, and 4.125” bore sizes\u003c\/li\u003e\n\u003cli\u003e.006” per cc flat milling available\u003c\/li\u003e\n\u003cli\u003eMinimum bore: 4.000”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDesigned for Builders Who Care About the Details\u003c\/h3\u003e\n\u003cp\u003eThese are not mass-produced heads. Each set is machined, assembled, hand blended, and inspected in small batches to maintain strict quality control and dimensional consistency.\u003c\/p\u003e\n\u003cp\u003eExtra deck thickness adds durability for higher cylinder pressure combinations. The PAC .660” dual spring setup provides valvetrain stability for serious cam profiles. Stock pushrod length works in most applications but should always be verified based on camshaft and final milling.\u003c\/p\u003e\n\u003cp\u003eIf you’re building a combination needing to stay stock valve angles \u0026amp; locations then this cylinder head is hard to beat!\u003c\/p\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":51841270219053,"sku":"MR-BR267LS3","price":2699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/files\/MR-BR267LS3.webp?v=1771882660"},{"product_id":"mangum-racing-275cc-11-degree-ls3-cylinder-heads","title":"Mangum Racing 275cc 11 degree LS3 Cylinder Heads","description":"\u003ch2\u003eMangum Racing 275cc 11° LS3 Cylinder Heads\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eMangum Racing CNC Ported MR275 11° LS3 Cylinder Heads\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eBuilt from the Mangum Racing 6-bolt 11° LS3 casting featuring a massive .750” deck surface, the MR275 is designed for maximum-effort naturally aspirated and boosted LS combinations where airflow, strength, and valvetrain stability are non-negotiable.\u003c\/p\u003e\n\u003cp\u003eThis casting was engineered for builders who want every available advantage — valve angle, deck thickness, port efficiency, and piston-to-valve clearance — all optimized to support serious compression and high cylinder pressure environments.\u003c\/p\u003e\n\u003cp\u003eEach set is fully CNC machined in-house on brand new Centroid 5-axis machining centers and finished on Newen seat \u0026amp; guide equipment. Every head is hand blended, inspected, and assembled in small batches to ensure repeatability and precision.\u003c\/p\u003e\n\u003ch3\u003eAirflow Performance\u003c\/h3\u003e\n\u003cp\u003eTested on a SuperFlow bench with a 4.125” bore plate\u003c\/p\u003e\n\u003cp\u003eIntake (Radius Entry)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 143 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 221 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 283 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 330 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 358 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 381 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExhaust (No Pipe)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.200” – 112 CFM\u003c\/li\u003e\n\u003cli\u003e.300” – 161 CFM\u003c\/li\u003e\n\u003cli\u003e.400” – 202 CFM\u003c\/li\u003e\n\u003cli\u003e.500” – 232 CFM\u003c\/li\u003e\n\u003cli\u003e.600” – 242 CFM\u003c\/li\u003e\n\u003cli\u003e.700” – 248 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWith a 275cc CNC intake runner and optimized 98cc exhaust port, the MR275 delivers exceptional mid-lift efficiency with dominant high-lift airflow. The 11° valve angle significantly improves piston-to-valve clearance, allowing aggressive cam timing and higher compression strategies without compromise.\u003c\/p\u003e\n\u003ch3\u003ePremium Hardware \u0026amp; Construction\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e6-bolt Mangum Racing 11° LS3 casting with .750” deck thickness\u003c\/li\u003e\n\u003cli\u003eOptimized 11° valve angle and revised valve locations\u003c\/li\u003e\n\u003cli\u003e2.185” hollow stem stainless extended-length intake valves\u003c\/li\u003e\n\u003cli\u003e1.600” stainless extended-length exhaust valves\u003c\/li\u003e\n\u003cli\u003eBronze guides\u003c\/li\u003e\n\u003cli\u003eChoice of PAC 1207X, 1208X, or 1209X dual spring packages\u003c\/li\u003e\n\u003cli\u003eTitanium retainers\u003c\/li\u003e\n\u003cli\u003eViton seals\u003c\/li\u003e\n\u003cli\u003e1.250” steel spring seats\u003c\/li\u003e\n\u003cli\u003e70.5cc fully CNC chambers (milling available at no charge)\u003c\/li\u003e\n\u003cli\u003eChamber softening options for 4.000”, 4.065”, and 4.125” bore sizes\u003c\/li\u003e\n\u003cli\u003eFlat milling at .006” per cc\u003c\/li\u003e\n\u003cli\u003eSubstantial piston-to-valve clearance for advanced camshaft profiles and compression increases\u003c\/li\u003e\n\u003cli\u003eMinimum bore: 4.000”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBuilt for Maximum Effort Combinations\u003c\/h3\u003e\n\u003cp\u003eThe increased deck thickness supports extreme cylinder pressure in large displacement and boosted applications. The revised 11° valve angle enhances airflow efficiency while providing additional mechanical clearance — a critical advantage in high-rpm, high-lift camshaft programs, or builds where smaller combustion chambers are required.\u003c\/p\u003e\n\u003cp\u003eThese heads have supported combinations exceeding 2,000 horsepower and 200+ mph in competition environments, making the MR275 a proven solution for serious LS3-based builds.\u003c\/p\u003e\n\u003cp\u003eIf you are building a no-compromise LS3 combination — naturally aspirated or power-adder — the MR275 was designed for exactly that purpose.\u003c\/p\u003e","brand":"MailOrder Tuner","offers":[{"title":"Default Title","offer_id":51841274904877,"sku":"MR-27511DLS3","price":3099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0253\/3097\/4819\/files\/MR-27511DLS3.webp?v=1771882840"}],"url":"https:\/\/mailordertuner.com\/collections\/clearance-parts-mail-order-tuner\/ls7.oembed","provider":"MailOrder Tuner","version":"1.0","type":"link"}