PRC Aftermarket LS3 As-Cast Cylinder Heads


Model Number: 199-PRCLS3ASCAST
Precision Race Components

As-Cast 257cc Intake Runners With CNC Machined Chambers & Valve Guides For Unmatched Flow!

68cc CNC Machined Chambers as Standard; Can Be Milled Down to 64cc Chambers & Still Retain Better than Factory Piston-to-Valve Clearance

Thicker Deck Surface Makes Them Ideal For Power-Adder Applications

2.17″ Intake / 1.600″ Stainless Valves

Utilizes Factory Rocker Arms

Includes TSP Dual Spring Kit w/ PAC .660″ Valve Springs!

Available with Hollow-Stem Intake Valves to Reduce Valvetrain Weight

The all new PRC LS3 As-Cast cylinder heads are now available for customers looking for the ultimate as-cast LS3 cylinder heads available. The new PRC as-cast intake port has been flow bench tested to flow 369 CFM & can support everything from smaller camshaft street engines all the way to all out race engines. The cylinder heads will come standard with 68cc chambers, and we can mill them as small as 64cc while still retaining better than factory piston-to-valve clearance! We can mill additionally to get to your desired chamber size for no additional charge!

Flow Data (4.00″ Flow Plate – No Exhaust Pipe):


.200″ 153 CFM 114 CFM

.300″ 233 CFM 163 CFM

.400″ 287 CFM 191 CFM

.500″ 329 CFM 214 CFM

.600″ 357 CFM 228 CFM

.650″ 369 CFM 233 CFM


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

SKU: 199-PRCLS3ASCAST Categories: ,