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PRC LS7x 265cc CNC Small Bore Heads
from $2,974.99
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PRC 247cc CNC Ported Cylinder Heads
from $2,499.99

PRC LS7x 265cc CNC Small Bore Heads

$3,935.99 Save $-3,935.99
Requires at least a 4.065" Bore 

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
  • 2.205"/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
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 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.

 

 

Superflow 600
  

 

    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 Small Bore Heads , TFS LS7 Heads , BTR - 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