The all new PRC 225cc As-Cast cylinder heads are available for customers looking for the ultimate as-cast cathedral LS heads. The new PRC as-cast intake port has been flow-bench tested to flow over 320 CFM and 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 with a smaller chamber designed for max power in stock cube applications. These are the same cylinder heads that were originally used on The Cutty from Discovery's Street Outlaws that produced 1,400 RWHP using a single turbo system and a GM 6.0L iron block!

***If you purchase a Melling oil pump you MUST use a single-roller timing set! The Melling oil pump will not clear a double-roller timing set!***

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
62cc CNC Machined Chambers
2.065" Hollow Stem Intake Valves / 1.600" Stainless Exhaust Valves
Utilizes Factory LS1 Rocker Arms

TSP .660 Dual Spring Kit w/ PAC Valve Springs and Titanium Retainers!

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.

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