04-06 GTO Heads

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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 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