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PRC LS7x 265cc CNC Heads
$3,935.99
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PRC 247cc CNC Ported Cylinder Heads
from $2,499.99
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PRC 237cc CNC Ported Cylinder Heads
$2,912.99

PRC LS7x 265cc CNC Heads

$3,935.99 Save $-3,935.99

Precision 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
Extensive CNC and dyno testing has resulted in one of the most affordable and powerful LS7-based cylinder heads available! Flowing up to 35 CFM more than the stock GM LS7 head, the all-new PRC cylinder heads offer both unmatched power and airflow!

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!

 

 

Flow Data:  @ 4.125" Bore Plate  Superflow 600
   

LS7 
Intake

  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.

PRC LS7x 265cc CNC Heads , BTR LS7 heads , LS7 Heads - Mail Order Tune
LS7 heads , PRC heads , Texas speed and Performance, Manley valve , CHE guides - Mail Order Tune
PRC LS7x 265cc CNC Heads , BTR LS7 heads , LS7 Heads - Mail Order Tune
LS7 heads , PRC heads , Texas speed and Performance, Manley valve , CHE guides - Mail Order Tune

PRC 247cc CNC Ported Cylinder Heads

$2,774.39 Save $-2,774.39

Precision Race Components all new cylinder head castings completed with 247cc runners. For 408 cubic inch and larger applications with 4.03"+ bore sizing.

Click Here to SEE why we build better heads!

MADE IN THE USA!!
CAST IN THE USA!!
MACHINED IN THE USA!!

Features: 
  • 247cc Fully CNC Ported Intake Runners
  • 84cc Fully CNC Ported Exhaust Runners
  • TSP Dual Spring Kit w/ PAC Springs Rated To .660" Lift
  • 68cc CNC Machined Chambers
  • CHE Bronze Guides
  • 2.120" Intake / 1.600" Stainless Valves
  • Factory Rocker Friendly!!*
  • ***NOW AVAILABLE WITH HOLLOW STEM INTAKE VALVES!!! SAVES APPROXIMATELY 15 Grams!!!***
The all new 247cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance.   The new 247cc port has been flow bench tested to flow over 360cfm. 

Flow Data:

 No Exhaust Pipe

 

LIFT INTAKE FLOW  EXHAUST FLOW 
 .100"   66 CFM  57 CFM 
 .200"    147 CFM  117 CFM
 .300"    228 CFM  170 CFM
 .400"    282 CFM  206 CFM
 .500"    321 CFM  227 CFM
 .600"    343 CFM  235 CFM
 .650"    355 CFM  241 CFM
.700"     360 CFM    245 CFM  
PRC 247cc CNC Ported Cylinder Heads - MailOrder Tuner

PRC 237cc CNC Ported Cylinder Heads

$2,912.99 Save $-2,912.99
Precision Race Components all new cylinder head castings completed with 237cc runners. For 370 cubic inch and larger applications with 4.00"+ bore sizing.

Click Here to SEE why we build better heads!

MADE IN THE USA!!
CAST IN THE USA!!
MACHINED IN THE USA!!

Features: 
  • 237cc Fully CNC Ported Intake Runners
  • 84cc Fully CNC Ported Exhaust Runners
  • TSP Dual Spring Kit w/ PAC Springs Rated To .660" Lift
  • 68cc CNC Machined Chambers(call for different chamber size)
  • CHE Bronze Guides
  • 2.100" Intake / 1.600" Stainless Valves  
  • Factory Rocker Friendly!!
  • ***NOW AVAILABLE WITH HOLLOW STEM INTAKE VALVES!!! SAVES APPROXIMATELY 15 Grams!!!***
The all new 237cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance.   The new 237cc port has been flow bench tested to flow over 330cfm & can support everything from smaller camshaft street engines all the way to all our race engines. This cylinder head is a combination of a max effort high flowing port combined. 

Flow Data:

4.030" Flow Plate - No Exhaust Pipe

 

LIFT INTAKE FLOW  EXHAUST FLOW 
 .100"   66 CFM  57 CFM 
 .200"    147 CFM  117 CFM
 .300"    225 CFM  170 CFM
 .400"    284 CFM  206 CFM
 .500"    325 CFM  227 CFM
 .600"    334 CFM  235 CFM
 .650"    339 CFM  241 CFM
PRC 237cc CNC Ported Cylinder Heads - MailOrder Tuner