Chevrolet C6 Corvette LS -LS3-LS7

HP Tuners VCM Suite MPVI4 Credit Pro Packages

The legacy continues … and now it is bigger, better, and faster!

Built for enthusiasts and professionals, MPV14 is the fastest, most sophisticated OBDII interface device to date, and Pro is the new standard. Take advantage of Pro Feature Set capabilities, like standalone data logging and PROLINK+ compatibility (sold separately), already built in. MPVI4 redefines the limits of speed and control with faster standalone data logging and two times the storage capacity compared to the previous generation. Log more runs (faster) and store more calibrations on your MPVI4, all with the convenience of eliminating your laptop from the equation.

HP Tuners VCM Suite MPVI4 Credit Pro packages equip you with the most inclusive scanning, logging, and calibration, making them the only tool you need in your toolbox. The MPVI4 connects your vehicle's control modules to HP Tuners' VCM Suite software. You can run complete diagnostics, monitor vehicle performance, read from various vehicle control modules, and more in VCM Suite. Optimize your performance, fuel economy, or whatever your vehicle goals may be in VCM Editor with a multitude of defined parameters. When you are ready, license and tune any vehicle currently supported by HP Tuners with the fastest read and write speeds available. Connect, read, edit, write, drive; HP Tuners VCM Suite MPVI4 Credit Pro packages are offered with or without tuning credits.

Our email tune is the fastest, cheapest way to get tuned in a few easy steps:

1. Fill out our handy online form during checkout

2. Email your tuning file to mailordertuner@gmail.com

3. We’ll email your tuned file back to you ASAP, usually within 1-3 business days

Note: you must have your own tuner such as an MPVI2+, MPVI3, MPVI4 or RTD to install your new tuning file.

IN STOCK 

Just fill out your handy online intake form and mail us your computer.

There is complete 3 page form to list your modifications. (For example, Camshafts, Tire size and DOD Deletes.)

We strive for 1 day turn around! This includes engine and transmission controllers!

Our email tune is the fastest, cheapest way to get tuned in a few easy steps:

1. Fill out our handy online form during checkout

2. Email your tuning file to mailordertuner@gmail.com

3. We’ll email your tuned file back to you ASAP, usually within 1-3 business days

Note: you must have your own tuner such as an MPVI4 to install your new tuning file.

- Credits Included

Want an email tune but need a tuner? Check out our handy bundles to get an MPVI4 with two tuning licenses along with your tuning file! Select overnight shipping for the fastest possible tune apart from a pure e-tune.

** THERE ARE NO REFUNDS AFTER THE SALE ON DIGITAL FILES - Once a file is sent you own it ****** 

Your Choice of Camshaft, TSP Spring kit, and Hardened Chromoly Pushrods 

This Package Includes the Following Items: 

• Your Choice of Camshaft
• Includes TSP .660" Dual Spring Kit w/ PAC Racing Polished Springs, Titanium Retainers, Hardened Spring Seats, and New Valve Stem Seals
• Texas Speed Hardened Chromoly Pushrods

We have two options listed for our dual valve spring kits.  The default option will use our PRC integrated one-piece seat and seal that simply pushes in place.  The other option is for the separate two-piece seat and seal that you typically find in any dual valve spring kit.  The two-piece kit will require separate installation of the valve seals after the seats are in place, and it does require a specific tool to make sure that the valve seals are installed properly (i.e. not crooked, torn, or not installed fully).  Our integrated seat and seal will make your installation much easier because it is virtually impossible to install it incorrectly!  You can choose either kit for no additional charge.  We have a picture listed when you select each spring kit so you can see the actual differences in the two kits.

This is only the device, the tune is not included -

The HP Tuners RTD4 is the next generation of Remote Tuning Devices, built for seamless wireless tuning, diagnostics, and datalogging. Designed specifically for professional tuner workflows, the RTD4 works hand-in-hand with the HP Tuners Tune Delivery Network (TDN) to deliver Dieselr’s custom calibrations directly to your vehicle — no laptop required.

Key Features:

• Supports 300+ Vehicle Controllers – Compatible with the latest HP Tuners-supported platforms, including CAN and VPP protocols.

• Wireless Tuning via TDN App – Flash tunes, send datalogs, and receive updates right from your iOS or Android device.

• Diagnostics Anywhere – Read and clear DTCs on the go.

• Faster Transfer Speeds – Built-in Wi-Fi hardware (enabled with future firmware update) for rapid file delivery and logging.

• Secure Workflow – Customers cannot access VCM Editor, ensuring calibration integrity and tuner IP protection.

• Fully Compatible with VCM Scanner – For complete diagnostics and logging functionality.

How It Works:

1. Read your vehicle’s data using the RTD4.

2. Send files to the MailOrderTuner tuning team via the free TDN app.

3. Receive your custom calibration.

4. Flash directly from your smartphone.

Why Choose the RTD4 from MailOrderTuner?
We don’t just sell you the device — we connect you to our tuning network for precise, dyno-tested calibrations built for real-world drivability and performance. Whether you’re on the track, trail, or highway, the RTD4 gives you professional-grade tuning power in your pocket.

Note: Base price is for the RTD4 device only. HP Tuners adapter cables, credits, and tuning are sold separately. 

Just fill out your handy online intake form and mail us your computer.

There is complete 3 page form to list your modifications. (For example, Camshafts, Tire size and DOD Deletes.)

We strive for 1 day turn around! This includes engine and transmission controllers!

TSP's all-new line of LS3 camshafts are the result of our latest round of engine dyno camshaft development using our state-of-the-art Superflow 902 engine dyno. Using a brand new LS3 crate engine, we started from scratch to build the most powerful LS3 camshafts available in the country.  Texas Speed & Performance continues to test and develop new designs to make sure that our customers have the BEST camshafts available!

The Stage 3 231/246 camshaft is a great choice for customers wanting a more aggressive camshaft with excellent power gains.  This camshaft is an excellent choice for customers wanting more power than our 229/244 and wanting a bit more of top-end power.  We recommend a minimum stall speed of 3,200 RPM for this camshaft in auto-equipped vehicles. We recommend this camshaft for LS3 or LS2 engines using L92/LS3 rectangle port cylinder heads! 

Specs:
231/246 .640"/615"  111 LSA, 109 ICL

Mangum Racing 273cc Qualcast LS7 Cylinder Heads

Mangum Racing CNC Ported 273 LS7 Cylinder Heads

Built 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.

Featuring 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.

Each 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.

Airflow Performance

Tested on a SuperFlow 1020 with a 4.125” bore plate

Intake (Radius Entry)

• .200” – 160 CFM
• .300” – 255 CFM
• .400” – 311 CFM
• .500” – 352 CFM
• .600” – 380 CFM
• .700” – 390 CFM

Exhaust (No Pipe)

• .200” – 117 CFM
• .300” – 160 CFM
• .400” – 209 CFM
• .500” – 221 CFM
• .600” – 230 CFM
• .700” – 244 CFM

The 273 LS7 delivers outstanding mid-lift efficiency with dominant high-lift airflow, making it ideal for aggressive street / strip combinations.

Premium Hardware & Construction

• 6-bolt Qualcast LS7 casting
• 12° valve angle with OEM LS7 valve spacing
• Stock Valve Lengths
• 273cc CNC intake port
• 93cc exhaust port
• 70.5cc CNC combustion chambers (milling available at no charge)
• 2.200” titanium intake valves
• 1.610” stainless exhaust valves
• Bronze CHE guides
• PAC .660” dual spring package
• Titanium retainers
• Viton seals
• 1.250” steel spring seats
• Chamber softening available
• Flat milling at .006” per cc
• Minimum bore: 4.100”

Designed for LS7 Street & Strip Builds

With 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.

Stock pushrod length works in many applications but should always be verified based on camshaft selection and final milling.

Mangum Racing 267cc LS3 Cylinder Heads

Mangum Racing CNC Ported MR 15° LS3 Cylinder Heads

Built 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.

This casting is designed to support 1,500+ horsepower combinations 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.

Each 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.

Airflow Performance

Tested on a SuperFlow bench with a 4.125” bore plate

Intake (Radius Entry)

• .200” – 148 CFM
• .300” – 227 CFM
• .400” – 282 CFM
• .500” – 325 CFM
• .600” – 350 CFM
• .700” – 363 CFM

Exhaust (No Pipe)

• .200” – 114 CFM
• .300” – 164 CFM
• .400” – 200 CFM
• .500” – 233 CFM
• .600” – 240 CFM
• .700” – 243 CFM

With 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.

Premium Hardware & Construction

• 6-bolt Mangum Racing LS3 casting with increased deck thickness
• 15° valve angle with OEM LS3 valve spacing
• 2.165” hollow stem stainless intake valves
• 1.600” hollow stem stainless exhaust valves
• Bronze guides
• PAC .660” dual spring package
• Titanium retainers
• Viton seals
• 1.250” steel spring seats
• 68.5cc CNC chambers (milling available at no charge)
• Chamber softening options for 4.000”, 4.065”, and 4.125” bore sizes
• Flat milling at .006” per cc
• Minimum bore: 4.000”

Built for High-Output Stock-Geometry Combinations

The 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.

The 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).

For builders who need to retain OEM valve angles and locations but demand serious airflow capability, the MR 15° LS3 casting delivers.

Mangum Racing Brodix 267cc LS3 Cylinder Heads

Mangum Racing CNC Ported Brodix 15° LS3 Cylinder Heads

Built 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.

Each set is fully CNC ported in-house with brand new Centroid 5-axis CNC mills and Newen seat & guide machines. Every set of cylinder heads is hand blended and carefully inspected before final assembly to ensure dimensional accuracy and consistency.

Airflow Performance

(4.125” Bore Plate)

Intake (Radius Entry)

• .200” – 148 CFM
• .300” – 227 CFM
• .400” – 282 CFM
• .500” – 325 CFM
• .600” – 350 CFM
• .700” – 363 CFM

Exhaust (No Pipe)

• .200” – 114 CFM
• .300” – 164 CFM
• .400” – 200 CFM
• .500” – 233 CFM
• .600” – 240 CFM
• .700” – 243 CFM

With 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 & race builds needing to retain the stock valve locations & angles.

Premium Hardware & Construction

• 6-bolt Brodix LS3 casting with increased deck thickness
• 15° valve angle, OEM LS3 valve spacing
• 2.165” hollow stem stainless intake valves
• 1.600” hollow stem stainless exhaust valves
• Bronze guides
• PAC .660” dual spring package
• Titanium retainers
• Viton seals
• 1.250” steel spring seats
• 68.5cc CNC chambers (milling available at no charge)
• Chamber softening options for 4.000”, 4.065”, and 4.125” bore sizes
• .006” per cc flat milling available
• Minimum bore: 4.000”

Designed for Builders Who Care About the Details

These 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.

Extra 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.

If you’re building a combination needing to stay stock valve angles & locations then this cylinder head is hard to beat!

Mangum Racing 275cc 11° LS3 Cylinder Heads

Mangum Racing CNC Ported MR275 11° LS3 Cylinder Heads

Built 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.

This 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.

Each set is fully CNC machined in-house on brand new Centroid 5-axis machining centers and finished on Newen seat & guide equipment. Every head is hand blended, inspected, and assembled in small batches to ensure repeatability and precision.

Airflow Performance

Tested on a SuperFlow bench with a 4.125” bore plate

Intake (Radius Entry)

• .200” – 143 CFM
• .300” – 221 CFM
• .400” – 283 CFM
• .500” – 330 CFM
• .600” – 358 CFM
• .700” – 381 CFM

Exhaust (No Pipe)

• .200” – 112 CFM
• .300” – 161 CFM
• .400” – 202 CFM
• .500” – 232 CFM
• .600” – 242 CFM
• .700” – 248 CFM

With 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.

Premium Hardware & Construction

• 6-bolt Mangum Racing 11° LS3 casting with .750” deck thickness
• Optimized 11° valve angle and revised valve locations
• 2.185” hollow stem stainless extended-length intake valves
• 1.600” stainless extended-length exhaust valves
• Bronze guides
• Choice of PAC 1207X, 1208X, or 1209X dual spring packages
• Titanium retainers
• Viton seals
• 1.250” steel spring seats
• 70.5cc fully CNC chambers (milling available at no charge)
• Chamber softening options for 4.000”, 4.065”, and 4.125” bore sizes
• Flat milling at .006” per cc
• Substantial piston-to-valve clearance for advanced camshaft profiles and compression increases
• Minimum bore: 4.000”

Built for Maximum Effort Combinations

The 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.

These 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.

If you are building a no-compromise LS3 combination — naturally aspirated or power-adder — the MR275 was designed for exactly that purpose.

IN STOCK 

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.

LS7 Lifters – (FAQ’s) Frequently Asked Questions

Precision Race Components LS7 CNC 265cc ported cylinder heads.

• 2.165"/1.59" Valves
• PRC Double Spring Kit AVAILABLE
• Completely Assembled & Setup To Your Specs!!

• Cylinder Head Cleaning
• CNC Valve Job
• CNC Porting
• Milling to customers specs
• Fully Assembled

*Typically a 1-2 week turn around time once heads arrive at our facility.

All Precision Race Components (PRC) cylinder heads come fully CNC-ported and machined using state-of-the-art technology!

Click Here to SEE why we build better heads!

MADE IN THE USA!!

CAST IN THE USA!!

MACHINED IN THE USA!!

PRC's aftermarket casting LS3/L92/L99 cylinder heads come standard with the following options:

• NEW PRC 13-Degree Valve Angle LS3 Castings
• Improved Piston-to-Valve Clearance For Extra Compression & Larger Camshafts
• Smaller Than Stock Intake Port Volume For Improved Port Velocity
• Manley Stainless 2.185" Intake, 1.60" Exhaust Valves
• Billet Rocker Pedestals
• TSP .660" Dual Spring Kit w/ PAC Valve Springs, Titanium Retainers, Seats, & Seals
• CHE Bronze Guides
• Completely Assembled and Milled to Your Specifications
• 60-68cc Chambers

All PRC cylinder heads are extensively researched and tested. The all-new PRC aftermarket casting LS3 cylinder heads are designed to flow considerably more than a gm ported casting while keeping the port sizes smaller for improved port velocity. The result is a cylinder head that is smaller than a stock GM LS3 port and moves more air than any other ls3 cylinder heads! 

The all new PRC aftermarket casting LS3 heads are the perfect option for customers looking for the ultimate in LS3/L99/L92 cylinder head technology

The PRC aftermarket casting LS3 cylinder heads are available in 2 different configurations: 

• 255cc Runners for max effort stock cube LS2/LS3/L99/L92 engines looking for a 370cfm cylinder head that can be aggressively milled & still keep better than stock p/v
• 260cc Runners For LS3/L99/L92 stroker engines needing a 380cfm+ cylinder head!

The 13-degree valve angle will allow for the ability to run more compression and larger camshafts thanks to additional piston-to-valve clearance!!  

With all PRC cylinder heads, quality and performance are our two highest priorities! In addition to performance, you will not find a better performing set of cylinder heads at this price (cost is for the pair!). Call one of our sales consultants today if you have any questions or if you would like to discuss your specific application. 

Our new and improved LS7 Stage 3.2 camshaft has taken what was already a proven camshaft and made it even better!  With our countless hours of testing on our SuperFlow 902 engine dyno, we were able to revise all of our LS7 camshafts for better power everywhere in the RPM band!  All camshafts were designed using a factory GM 7.0L LS7 engine with no other internal changes.

This camshaft features custom-ground lobes specifically designed for the LS7! These lobes not only make excellent power throughout the entire RPM band, but they are also much more stable.  So, this equates to a quieter and longer lasting valvetrain compared to most other comparable camshafts on the market.  Like all TSP camshafts, they are 100% developed, ground, and polished in-house using our state-of-the-art Landis CNC camshaft grinders!

2800 - 6900 RPM Power Band; This is an excellent performance camshaft with an aggressive idle!  Custom tuning will be required for this camshaft.  It will have a lopey idle and will pull hard through the mid and upper RPM band.

TSP's all-new line of LS3 camshafts are the result of our latest round of engine dyno camshaft development using our state-of-the-art Superflow 902 engine dyno. Using a brand new LS3 crate engine, we started from scratch to build the most powerful LS3 camshafts available in the country.  Texas Speed & Performance continues to test and develop new designs to make sure that our customers have the BEST camshafts available!

The Stage 4 235/248 camshaft is the perfect choice for customers wanting the MOST powerful camshaft available that still offers adequate piston-to-valve clearance on a stock short-block.  This TSP camshaft is designed for all-out power and shows gains over the stock camshaft beginning at 3,100 RPM.  The cam will pull really hard from 4,500 RPM up to the 6,600 RPM HP peak. This TSP camshaft makes 93 flywheel HP more than the factory LS3 camshaft! We recommend a minimum stall speed of 3,600 RPM for this camshaft in auto-equipped vehicles for streetability, but it would benefit at the track from a 4,000+ RPM stall speed. This cam is designed for LS2/L76/LS3 engines using L92/LS3 rectangle port cylinder heads! 

Specs:
235/248 .649"/615"  111 LSA, 109.5 ICL (Other LSAs Available)

TSP F-35 CAMSHAFT DYNO TEST RESULTS
Camshaft	Peak Gain HP/TQ	Peak HP/RPM	Peak TQ/RPM	Avg. HP 3000-6000 RPM	Avg. TQ 3000-6000 RPM
Stock	--	484 @ 5700	479 @ 4300	399.4	441.4
235/248 111 LSA	93/27	577 @ 6600	506 @ 5400	428.1	467.8

**The factory LS3 camshaft uses a single-bolt cam design, which means one bolt holds the upper timing sprocket on the camshaft.  For LS3 vehicles, you can either go back in with a single-bolt camshaft or convert to the three-bolt camshaft design that the 1997-2006 LS-based vehicles use.  The three-bolt conversion kit will supply the correct 4x upper timing gear to supply the correct camshaft position signal, as well as the ARP camshaft bolt kit that will supply the three required bolts.  We also offer the conversion kit with a complete, upgraded timing set for those wanting to replace the entire set.**

Your Choice of Camshaft, Double Spring Kit, and Hardened Chromoly Pushrods.

This package will include the following items: 

• Your LS-3 camshaft of choice
• TSP Dual Spring Kit w/ PAC Polished .660" Springs, Retainers, New Seats, & New Seals
• Texas Speed Hardened Chromoly Pushrods

Note: The factory LS3 camshaft uses a single-bolt cam design, which means one bolt holds the upper timing sprocket on the camshaft. For LS3 vehicles, you can either go back in with a single-bolt camshaft or convert to the three-bolt camshaft design that the 1997-2006 LS-based vehicles use. The three-bolt conversion kit will supply the correct 4x upper timing gear to supply the correct camshaft position signal, as well as the ARP camshaft bolt kit that will supply the three required bolts. We also offer the conversion kit with a complete, upgraded timing set for those wanting to replace the entire set.

We have two options listed for our dual valve spring kits.  The default option will use our PRC integrated one-piece seat and seal that simply pushes in place.  The other option is for the separate two-piece seat and seal that you typically find in any dual valve spring kit.  The two-piece kit will require separate installation of the valve seals after the seats are in place, and it does require a specific tool to make sure that the valve seals are installed properly (i.e. not crooked, torn, or not installed fully).  Our integrated seat and seal will make your installation much easier because it is virtually impossible to install it incorrectly!  You can choose either kit for no additional charge.  We have a picture listed when you select each spring kit so you can see the actual differences in the two kits.