Precision Race Components 227cc CNC Ported Small Bore 3.9″-4″ Cylinder Heads

Precision Race Components presents its brand-new cylinder head castings with 227cc runners, tailored for stock cubic inch LS1/LS2 engines desiring increased compression through smaller chambers.

Origin:

• Entirely Made, Cast, and Machined in the USA.

Key Features:

• 227cc CNC Ported Intake Runners
• 84cc CNC Ported Exhaust Runners
• Chambers designed specifically for 3.9″-4″ bore applications for enhanced horsepower & torque
• TSP .660 Spring Kit with PAC Valve Springs & Titanium Retainers
• 62cc precision-machined chambers
• CHE Bronze Guides
• 2.065″ Hollow Stem Intake Valves and 1.600″ Stainless Exhaust Valves
• Compatible with factory rockers

This new 227cc cylinder head stands at the forefront of LS cathedral port performance. Proven to deliver superior power, it has set records, with the ability to support varied engines from street to race types. It’s the same head that helped the Texas Speed 98 Camaro achieve a remarkable 1/4 mile record of 9.66 seconds.

Flow Data:

4.00″ Flow Plate – No Exhaust Pipe

LIFT INTAKE FLOW EXHAUST FLOW
.100″ 68 CFM 56 CFM
.200″ 145 CFM 115 CFM
.300″ 214 CFM 167 CFM
.400″ 261 CFM 202 CFM
.500″ 300 CFM 219 CFM
.600″ 322 CFM 238 CFM
.650″ 330 CFM 236 CFM

Flow Data:

4.00″ Flow Plate – No Exhaust Pipe

LIFT	INTAKE FLOW	EXHAUST FLOW
.100″	68 CFM	56 CFM
.200″	145 CFM	115 CFM
.300″	214 CFM	167 CFM
.400″	261 CFM	202 CFM
.500″	300 CFM	219 CFM
.600″	322 CFM	238 CFM
.650″	330 CFM	236 CFM

Texas Speed and Performance