Filter
- 1999-2013 Chevrolet Silverado 1500
- 1999-2013 GMC Sierra 1500
- 1999-2014 Cadillac Escalade
- 1999-2014 Chevrolet Surburban
- 265cc
- 427
- 5.3
- 5.3 truck
- 5.7
- cam
- cam install kit
- Cam Packages
- camaro
- Camaro 5 Tune
- Camaro ls3
- Camaro5 tune
- cammed ls
- cammed silverado
- corvette ls3
- Cylinder heads
- F-35
- F35
- GM ls7 lifter
- hptuners
- HPTUNERS CUSTOM TUNE
- HPTUNERS KIT
- Hptuners MPVI
- hptuners pro
- L83 Oil consumption
- ls cam
- LS1 5.7
- ls1 camshaft
- ls1 Email tune
- ls2
- LS2 tuner
- ls3
- ls3 camaro
- LS3 camshaft kit
- LS3 gto tune
- ls3 heads
- LS3 tune
- ls6
- ls6 tune
- ls6 tuner
- ls6 tuning
- LS7
- ls7 lifter
- LSX
- LSX tune
- LSX tuner
- lsx tuning
- mail order tune
- MailOrderTune
- MailOrdertuner
- Mangum Racing
- MPVI4
- oil consumption
- PRC
- PRC heads
- Remote tune
- Remote tuner
- silverado 5.3
- silverado cam
- silverado camshaft
- SIlverado tune
- Silverado tuner
- stage 1
- stage 2
- stage 3 camshaft
- Stage 4 cam
- stage 4 camshaft
- texas speed
- Texas speed tune
- Texas Speed tuner
- trans
- truck cam
- truck camshaft
- tsp lifters
- VVT camshaft
- z28
- 1999-2013 Chevrolet Silverado 1500
- 1999-2013 GMC Sierra 1500
- 1999-2014 Cadillac Escalade
- 1999-2014 Chevrolet Surburban
- 265cc
- 427
- 5.3
- 5.3 truck
- 5.7
- cam
- cam install kit
- Cam Packages
- camaro
- Camaro 5 Tune
- Camaro ls3
- Camaro5 tune
- cammed ls
- cammed silverado
- corvette ls3
- Cylinder heads
- F-35
- F35
- GM ls7 lifter
- hptuners
- HPTUNERS CUSTOM TUNE
- HPTUNERS KIT
- Hptuners MPVI
- hptuners pro
- L83 Oil consumption
- ls cam
- LS1 5.7
- ls1 camshaft
- ls1 Email tune
- ls2
- LS2 tuner
- ls3
- ls3 camaro
- LS3 camshaft kit
- LS3 gto tune
- ls3 heads
- LS3 tune
- ls6
- ls6 tune
- ls6 tuner
- ls6 tuning
- LS7
- ls7 lifter
- LSX
- LSX tune
- LSX tuner
- lsx tuning
- mail order tune
- MailOrderTune
- MailOrdertuner
- Mangum Racing
- MPVI4
- oil consumption
- PRC
- PRC heads
- Remote tune
- Remote tuner
- silverado 5.3
- silverado cam
- silverado camshaft
- SIlverado tune
- Silverado tuner
- stage 1
- stage 2
- stage 3 camshaft
- Stage 4 cam
- stage 4 camshaft
- texas speed
- Texas speed tune
- Texas Speed tuner
- trans
- truck cam
- truck camshaft
- tsp lifters
- VVT camshaft
- z28
3 products
Mangum Racing 273cc LS7 Cylinder Heads
Regular price $3,299.99 Save $-3,299.99Mangum 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.
PRC LS7x 265cc CNC Small Bore Heads
Regular price $3,935.99 Save $-3,935.99Requires at least a 4.065" Bore
Click Here to SEE why we build better heads!
MADE IN THE USA!!
CAST IN THE USA!!
MACHINED IN THE USA!!
- PRC 6-Bolt LS7 Cylinder Heads with Thicker Deck Surface
- Will Work on Both Standard GM 4-Bolt & Aftermarket LSx / RHS 6-Bolt Style Engine Blocks
- 2.205"/1.59" Valves
- TSP .660" Dual Spring Kit w/ PAC Springs, Retainers, Seats, & Seals
Springs, Titanium Retainers, Seats, & Seals - CHE Bronze Guides
- Completely Assembled & Setup To Your Specs
- Available With Stainless Steel, Hollow-Stem, or Titanium Intake Valves
- 68cc Chamber Size as Standard
The PRC Small Bore LS7 cylinder heads are designed for both stroker, and stock cube applications with a 4.060"-4.100" bore. For bores larger than 4.100" bore checkout the PRC LS7 265cc & 285cc cylinder heads!
The PRC LS7 cylinder heads are available with hollow-stem intake and titanium intake valves. We recommend no more than .625" total intake valve lift with the hollow-stem intake valves and no more than .670" total valve lift with the titanium intake valves.
The PRC LS7 cylinder heads are available with hollow-stem intake and titanium intake valves. We recommend no more than .625" total intake valve lift with the hollow-stem intake valves and no more than .670" total valve lift with the titanium intake valves.
| PRC 265cc LS7 Intake |
PRC LS7 Exhaust | |
| .200 | 169 | 118 |
| .300 | 246 | 176 |
| .400 | 304 | 208 |
| .500 | 348 | 221 |
| .600 | 380 | 230 |
| .650 | 383 | 235 |
| .700 | 388 | 240 |
**Valve spring lift ratings are based on using titanium intake valves.
PRC LS7x 265cc CNC Heads
Regular price $3,935.99 Save $-3,935.99Precision Race Components LS7 CNC 265cc ported cylinder heads.
Click Here to SEE why we build better heads!
MADE IN THE USA!!
CAST IN THE USA!!
MACHINED IN THE USA!!
- PRC 6-Bolt LS7 Cylinder Heads with Thicker Deck Surface
- Will Work on Both Standard GM 4-Bolt & Aftermarket LSx / RHS 6-Bolt Style Engine Blocks
- 2.200"/1.610" Valves
- TSP .660" Dual Spring Kit w/ PAC Springs, Retainers, Seats, & Seals
Springs, Titanium Retainers, Seats, & Seals - CHE Bronze Guides
- Completely Assembled & Setup To Your Specs
- Available With Stainless Steel, Hollow-Stem, or Titanium Intake Valves
The PRC LS7 cylinder heads is available with standard stainless valves, hollow-stem intake, and titanium intake valves. If you are going to run the stainless steel intake valves, we recommend limiting total valve lift to no more than .616" due to the weight of the intake valve. Upgrading to the hollow-stem intake valve will shed significant intake valve weight and allow for additional lift. The titanium intake valves will be the lightest choice of the three choices and offer the best lift possible!
|
LS7 |
LS7 Exhaust | PRC 265cc LS7 Intake |
PRC LS7 Exhaust | |
| .200 | 161 | 114 | 169 | 119 |
| .300 | 227 | 171 | 248 | 179 |
| .400 | 291 | 193 | 308 | 211 |
| .500 | 330 | 203 | 351 | 224 |
| .600 | 351 | 209 | 383 | 235 |
| .650 | 353 | 204 | 388 | 241 |
| .700 | 353 | 209 | 393 | 246 |
**Valve spring lift ratings are based on using titanium intake valves.
