PRC 225cc As-Cast Big Chamber Heads & Cam Package

Overview

Take your 5.7L or larger cathedral-port LS engine to the next level with one of the highest flowing as-cast cylinder head packages available. This package combines a pair of fully assembled PRC 225cc Big Chamber As-Cast cylinder heads with your choice of any compatible Texas Speed cathedral-port camshaft, allowing you to build the combination that best fits your horsepower goals.

The PRC 225cc heads feature a high-efficiency as-cast intake runner capable of flowing over 320 CFM, CNC-machined combustion chambers, premium valves, and our proven TSP/PAC dual valve spring package. The larger 68cc combustion chamber makes these heads an excellent choice for larger displacement engines, forced induction combinations, nitrous applications, or builders looking to maintain a lower compression ratio.

Designed for larger displacement cathedral-port LS engines, these heads are recommended for 5.7L, 6.0L, and larger LS combinations. Due to the large 2.065" intake valves, they require a minimum 3.903" cylinder bore for proper valve clearance.

What's Included

Pair of PRC 225cc Big Chamber As-Cast Cathedral-Port Cylinder Heads
Your choice of Texas Speed Cathedral-Port Camshaft
TSP .660" Dual Valve Spring Kit with PAC Springs & Titanium Retainers

Cylinder Head Features

225cc as-cast intake runners
Flows over 320 CFM
68cc CNC-machined combustion chambers
2.065" hollow-stem intake valves
1.600" stainless steel exhaust valves
Uses factory LS1-style rocker arms
Designed for high-performance naturally aspirated, turbocharged, supercharged, and nitrous combinations

Flow Data

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

Fitment & Important Notes

Designed for cathedral-port LS engines.
Recommended for 5.7L, 6.0L, and larger engine combinations.
Requires a minimum 3.903" cylinder bore due to the 2.065" intake valves.
The larger 68cc chamber is ideal for larger displacement engines or applications where a lower compression ratio is desired.
Your choice of compatible Texas Speed cathedral-port camshaft is included.
If selecting a Melling oil pump, a single-roller timing set is required. Melling pumps will not clear a double-roller timing set.