PRC LS7x 285cc CNC Ported 400+CFM Heads

The Precision Race Components LS7 CNC 285cc Ported Cylinder Heads feature an all-new 6-bolt design developed for high-horsepower LS7-based combinations. Extensive CNC and dyno development delivers increased airflow while the thicker deck surface provides compatibility with both standard GM 4-bolt and aftermarket LSX/RHS 6-bolt-style engine blocks.

The larger 285cc intake runner is recommended for higher-horsepower applications with a minimum 4.125″ bore. Flow testing on a SuperFlow 600 shows intake airflow reaching 407 CFM at .700″ lift.

KEY FEATURES

• 285cc CNC-Ported LS7 Intake Runners
• PRC 6-Bolt LS7 Cylinder Head Design with Thicker Deck Surface
• 2.245″ Titanium Intake Valves
• 1.610″ Stainless Hollow-Stem Exhaust Valves
• TSP .660″ Spring Kit with PAC Valve Springs
• Titanium Retainers
• CHE Bronze Valve Guides
• Compatible with Standard GM 4-Bolt and Aftermarket LSX/RHS 6-Bolt-Style Engine Blocks
• Cast, Machined, and Completely Assembled in the USA

CYLINDER HEAD SPECIFICATIONS

• Valve Angle: 12°
• Intake Runner Volume: 285cc
• Intake Valve: 2.245″ Titanium
• Exhaust Valve: 1.610″ Stainless Hollow Stem
• Chamber Size: 70cc
• Minimum Recommended Bore: 4.125″

FLOW DATA

Flow comparison data for the PRC 285cc LS7 cylinder heads and the tested GM LS7 cylinder heads:

BLOCK COMPATIBILITY

• Standard GM 4-Bolt LS Engine Blocks
• Aftermarket LSX 6-Bolt-Style Engine Blocks
• Aftermarket RHS 6-Bolt-Style Engine Blocks

Note: The 285cc runner is recommended for higher-horsepower applications with a minimum bore size of 4.125″. Valve spring lift ratings are based on the use of titanium intake valves.

Learn more about Precision Race Components cylinder heads.