• 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