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GM LSX Center-bolt Valve Cover Gasket
$16.95
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PRC LS7x 265cc CNC Small Bore Heads
from $2,974.99
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PRC LS7x 265cc CNC Heads
$3,935.99
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PRC LS7x 265cc 7.0L CNC Head Porting
from $959.99
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PRC LS3, L92, & LSA CNC Cylinder Head Porting
from $899.99
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PRC LS3 Aftermarket 6-Bolt 260cc CNC Cylinder Heads
from $2,709.99
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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
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PRC 227cc CNC Ported Small Bore 3.9"-4" Cylinder Heads
from $2,399.99

GM LSX Center-bolt Valve Cover Gasket

$16.95 Save $-16.95
GM LSX center-bolt valve cover gaskets. Works in 1999+ GM valve covers!

GASKETS ARE SOLD INDIVIDUALLY!
GM LSX Center-bolt Valve Cover Gasket - MailOrder Tuner

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 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 LS7x 265cc 7.0L CNC Head Porting

$959.99 Save $-959.99
These are for customer supplied cylinder heads. We are not supplying castings! This is porting, valve job, and milling only!

Precision Race Components LS7 CNC 265cc ported cylinder heads.  Fully CNC ported LS7-based cylinder heads! (All New GM LS7 Cylinder Head Castings)

  • Based off PRC's CNC Ported LS7 Heads
  • 2.200"/1.610" Valves (base price for exchange includes new stainless exhaust valves)
  • Available with PRC Double Spring Kit Complete With PRC Double Springs, Titanium Retainers, Seats, & Seals
  • Completely Assembled & Setup To Your Specs!!
  • Available With Stainless, Hollow Stems, or titanium valves!
Extensive CNC & dyno testing has resulted in one of the most affordable & powerful LS7 based cylinder heads available! Flowing up to 35cfm more than the stock GM LS7 head, the all new PRC cylinder head offers both unmatched power & airflow.  The PRC LS7 cylinder head is available with standard stainless exhaust valves and titanium intake valves.

 

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


**If stock valve guides are damaged or badly worn, there is an additional $150 fee to replace them.
**If stock guides are replaced, stock springs can not be used due to the larger O.D. of the aftermarket guide. Spring kit must be replaced with aftermarket as well.
PRC LS7x 265cc 7.0L CNC Head Porting - MailOrder Tuner
TSP LS7 heads, trick flow LS7 heads, PRC LS7 , Manley valve , stainless valve , LS7 engine , GM 7.0 Heads - Mail Order Tune
PRC LS7x 265cc 7.0L CNC Head Porting - MailOrder Tuner
TSP LS7 heads, trick flow LS7 heads, PRC LS7 , Manley valve , stainless valve , LS7 engine , GM 7.0 Heads - Mail Order Tune

PRC LS3, L92, & LSA CNC Cylinder Head Porting

$899.99 Save $-899.99
Tons of R&D on both the flow bench & engine dyno has created one of the leading LS3/ cylinder heads available!

The PRC LS3 cylinder heads porting for customers with existing LS-3 cylinder heads.  Corvette & 2010 Camaro customers can now send in their heads to be ported!

 

 Stock Valve Weight

 Stainless Valve Weight

Hollow Stem Valve Weight 

 106

 122

 91

 Grams

 Grams

 Grams

Precision Race Components LS3/L92 CNC ported cylinder heads.  Fully CNC ported LS3-based cylinder heads!
  • 2.165"/1.59" Valves
  • PRC Double Spring Kit AVAILABLE
  • Completely Assembled & Setup To Your Specs!!
Service Includes:
  • Cylinder Head Cleaning
  • CNC Valve Job
  • CNC Porting
  • Milling to customers specs
  • Fully Assembled
Dyno Tested 25+HP Gains Over Stock 6.2L Cylinder Heads!



 PRC LS3 Intake  PRC LS3 Exhaust
       cfm  cfm
 .200
   154  115
 .300  
 223  170
 .400
   282  198
 .500      324  211
 .600      351  228
 .650
   358  232

 

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

PRC LS3, L92, & LSA CNC Cylinder Head Porting , TSP head porting - Mail Order Tune
PRC LS3, L92, & LSA , stainless valves , CNC porting , LS3 heads , L99 heads , PAC springs - Mail Order Tune
PRC LS3, L92, & LSA CNC Cylinder Head Porting , TSP head porting - Mail Order Tune
PRC LS3, L92, & LSA , stainless valves , CNC porting , LS3 heads , L99 heads , PAC springs - Mail Order Tune

PRC LS3 Aftermarket 6-Bolt 260cc CNC Cylinder Heads

$2,937.59 Save $-2,937.59

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!!  

 Lift

Intake Flow 

 Exhaust Flow

 .200"

 157 cfm

 117 cfm

 .300"

 224 cfm

 170 cfm

 .400"

 279 cfm

205 cfm

 .500"

 329 cfm

 225 cfm

 .600"

 360 cfm

 235 cfm
 .650"  372 cfm  240 cfm
 .700"  380 cfm  243 cfm


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. 

PRC LS3 Heads . PRC 260cc , CNC heads , LS3 260cc Cylinder heads - Mail Order Tuner
PRC LS3 heads , Stainless valves , PAC springs , LS3 260cc heads , Best LS3 heads, BTR , PCM of NC , Summit racing LS3 heads - Mail Order Tune
PRC LS3 Heads . PRC 260cc , CNC heads , LS3 260cc Cylinder heads - Mail Order Tuner
PRC LS3 heads , Stainless valves , PAC springs , LS3 260cc heads , Best LS3 heads, BTR , PCM of NC , Summit racing LS3 heads - 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

PRC 227cc CNC Ported Small Bore 3.9"-4" Cylinder Heads

$2,399.99 Save $-2,399.99
Precision Race Components all new cylinder head castings completed with 227cc runners. For stock cubic inch LS1/LS2 applications requiring smaller chambers for extra compression

Click Here to SEE why we build better heads!

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

Features: 
  • 227cc Fully CNC Ported Intake Runners
  • 84cc Fully CNC Ported Exhaust Runners
  • Small Bore Chambers For Increased Horsepower & Torque+ SPECIFICALLY DESIGNED FOR 3.9"-4" BORE APPLICATIONS
  • TSP Spring Kit w/ PAC Valve Springs Rated To .660" Lift
  • 62cc CNC Machined Chambers(call for smaller CC)
  • CHE Bronze Guides
  • 2.065" Intake / 1.600" Stainless Valves  ***NOW AVAILABLE WITH HOLLOW STEM INTAKE VALVES!!!***
  • Factory Rocker Friendly!!*
The all new 227cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance.  Now is your chance to own the same cylinder head that currently holds the fastest stock bottom end heads / cam record!  The new 227cc port has been flow bench tested to flow over 320cfm & 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 with a smaller chamber designed for max power in stock cube applications. 

This cylinder head was used on the Texas Speed 98 Camaro when it lowered the heads cam stock bottom end 1/4 mile record to 9.66!!


Flow Data:

4.00" Flow Plate - No Exhaust Pipe

 

LIFT INTAKE FLOW  EXHAUST FLOW 
 .100"   68 CFM  56 CFM 
 .200"    145 CFM  115 CFM
 .300"    214 CFM  167 CFM
 .400"    261 CFM  202 CFM
 .500"    300 CFM  219 CFM
 .600"    322 CFM  238 CFM
 .650"    330 CFM  236 CFM
PRC 227cc CNC Ported Small Bore 3.9"-4" Cylinder Heads - MailOrder Tuner