PRC CNC Porting Service - Cathedral Port Heads (Customer Supplied Castings)

$899.99

The price listed is for you sending your cathedral port cylinder heads (4.8/5.3, LS1, LS6, LS2, LQ4/9) to us for porting. Our stage 1 porting service will include the re-use of the stock vales. Stage 2.5 will include aftermarket 2.02/1.57 stainless steel valves. We also offer valve spring upgrades.

PRC CNC Porting/Machining Service Includes:

Disassembly
Deep Cleaning
CNC Porting
CNC Valve Job
CNC Engraving of PRC Logos
CNC Milling to Your Specs
Reassembly
Pressure Testing

Click Here to SEE why we build better heads! All Precision Race Components (PRC) cylinder heads come fully CNC-ported and machined using state-of-the-art technology. With all PRC cylinder heads, quality and performance are our two highest priorities! In addition to this, you will not find a better performing cylinder head porting service at this price. Call one of our sales consultants today if you have any questions or if you would like to discuss your specific application.

Stage 2.5 5.3L Flow Chart
Lift	Intake Flow	Exhaust Flow
.200"	147 cfm	111 cfm
.300"	207 cfm	145 cfm
.400"	254 cfm	185 cfm
.500"	291 cfm	204 cfm
.600"	308 cfm	223 cfm

Stage 1.0 LS6 Flow Chart
Lift	Intake Flow	Exhaust Flow
.200"	147 cfm	114 cfm
.300"	207 cfm	148 cfm
.400"	255 cfm	187 cfm
.500"	292 cfm	202 cfm
.600"	313 cfm	220 cfm

Stage 2.5 LS6 Flow Chart
Lift	Intake Flow	Exhaust Flow
.200"	147 cfm	114 cfm
.300"	207 cfm	152 cfm
.400"	255 cfm	191 cfm
.500"	292 cfm	207 cfm
.600"	316 cfm	226 cfm

Stage 1.0 LQ9 Flow Chart
Lift	Intake Flow	Exhaust Flow
.200"	147 cfm	114 cfm
.300"	207 cfm	148 cfm
.400"	255 cfm	187 cfm
.500"	292 cfm	202 cfm
.600"	313 cfm	220 cfm

Stage 2.5 LQ9 Flow Chart
Lift	Intake Flow	Exhaust Flow
.200"	147 cfm	114 cfm
.300"	209 cfm	152 cfm
.400"	258 cfm	191 cfm
.500"	294 cfm	207 cfm
.600"	316 cfm	226 cfm

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

*Stage 1 porting NOT available for 4.8L and 5.3L castings due to the factory 1.94" intake valve size. All 4.8L and 5.3L cylinder heads must select the stage 2.5 option that includes 2.02"/1.57" stainless steel valves!

Castings:

4.8/5.3 (706/862)
LS1 (241/853)
LQ4/LQ9 (317)
LS6/LS2 (243/799)

GM LSX Center-bolt Valve Cover Gasket

$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

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 LS3 Aftermarket 6-Bolt 260cc CNC Cylinder Heads

$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 As-Cast 225cc LS1/LS2 Cathedral Heads

$2,203.19

Precision Race Components all new as-cast cylinder heads completed with CNC machined chambers & valve guides. For LS1/LS2 applications requiring a high flow aftermarket cylinder head at a unbelievable price!

Click Here to SEE why we build better heads!

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

As-Cast 225cc Intake Runners With CNC Machined Chambers & Valve Guides For Unmatched Flow!
Small Bore Configurations for extra compression applications while keeping good piston to valve clearance
Large Bore Configurations for customers looking for bigger bores such as stroker or boost applications
62cc or 68cc CNC Machined Chambers (Can be milled to your desired specs)
2.06" Intake / 1.600" Stainless Valves
Utilizes Factory LS1 Rocker Arms
Includes TSP Dual Spring Kit w/ PAC .660" Valve Springs!
***NOW AVAILABLE WITH HOLLOW STEM INTAKE VALVES!!! SAVES APPROXIMATELY 15 Grams!!!***

The all new PRC 225cc As-Cast cylinder heads are finally available for customers looking for the ultimate as-cast cathedral LS heads available. The new PRC as-cast intake port has been flow bench tested to flow over 320cfm & can support everything from smaller camshaft street engines all the way to all out 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. You have your choice of the 62cc chambers used in the PRC 227cc cylinder heads or the 68cc chambers used in the PRC 237cc cylinder heads. We can mill additionally to get to your desired chamber size for no additional charge!

Flow Data (4.00" Flow Plate - No Exhaust Pipe):

LIFT	INTAKE FLOW	EXHAUST FLOW
.100"	68 CFM	56 CFM
.200"	145 CFM	113 CFM
.300"	210 CFM	164 CFM
.400"	257 CFM	200 CFM
.500"	300 CFM	214 CFM
.600"	318 CFM	229 CFM
.650"	321 CFM	230 CFM

Texas Speed and Performance Precision Race Components Heads , LS1 heads , LS2 heads , Turbo 5.3

Texas Speed and Performance Precision Race Components Heads

PRC 247cc CNC Ported Cylinder Heads

$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 220cc 15-Degree CNC Cathedral Heads

$2,089.99

Precision Race Components all new cylinder head castings completed with 220cc runners. For stock cubic inch LS1/LS2 applications requiring a stock valve angle LS cylinder head with extra thick decks comparable to stock piston to valve.

Click Here to SEE why we build better heads!

MADE IN THE USA!!

CAST IN THE USA!!

MACHINED IN THE USA!!

Features:

220cc Fully CNC Ported Intake Runners
84cc Fully CNC Ported Exhaust Runners
Designed as a bolt on cylinder head with minimal change to pushrod length
TSP Spring Kit w/ PAC Valve Springs Rated To .660" Lift
64cc CNC Machined Chambers
CHE Bronze Guides
2.045" Intake / 1.600" Stainless Valves
Factory Rocker Friendly!!*
Extra Thick Deck Surfaces For Power Adders

The all new 220cc cylinder head is finally available for customers looking for a bolt on 15 degree LS cathedral cylinder head. Think of this cylinder head as the ultimate 15 degree LS1/LS2 cylinder heads for guys wanting a stronger replacement to the LS1 / LS6 / LS2 factory casting. The perfect head for guys wanting a aftermarket casting that will retain the use of all there existing components.

PRC 220cc 15-Degree CNC Cathedral Heads - MailOrder Tuner

PRC 15-Degree 220cc As-Cast Cathedral Heads

$1,820.69

Precision Race Components all new cylinder head castings completed with 220cc runners. For stock cubic inch 4.8/5.3/LS1/LS2 applications requiring a stock valve angle LS cylinder head with extra thick decks comparable to stock piston to valve.

Click Here to SEE why we build better heads!

MADE IN THE USA!!

CAST IN THE USA!!

MACHINED IN THE USA!!

Features:

220cc Intake Runners
84cc Exhaust Runners
Designed as a bolt on cylinder head with minimal change to pushrod length
TSP Spring Kit w/ PAC Valve Springs Rated To .660" Lift
64cc CNC Machined Chambers
CHE Bronze Guides
2.045" Intake / 1.600" Stainless Valves
Factory Rocker Friendly!!*
Extra Thick Deck Surfaces For Power Adders

The all new 220cc cylinder head is finally available for customers looking for a bolt on 15 degree LS cathedral cylinder head. Think of this cylinder head as the ultimate 15 degree LS1/LS2 cylinder heads for guys wanting a stronger replacement to the LS1 / LS6 / LS2 factory casting. The perfect head for guys wanting a aftermarket casting that will retain the use of all there existing components.

Flow Data:

4.00" Flow Plate - No Exhaust Pipe

LIFT	INTAKE FLOW	EXHAUST FLOW
.100"	67 CFM	55 CFM
.200"	145 CFM	113 CFM
.300"	207 CFM	166 CFM
.400"	252 CFM	200 CFM
.500"	292 CFM	215 CFM
.600"	304 CFM	226 CFM
.650"	311 CFM	228 CFM

Stock rocker arms will cause increased guide wear in applications over .600" lift. Roller rockers can help to reduce this wear.