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.

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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!

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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 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.

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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

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