Patriot's custom 5 axis CNC machined new GM castings make these heads a must have for any performance oriented GM LS series engine. These heads provide up to a 65 cfm improvement over stock OEM versions. The 64cc chambers will increase the compression on a stock LS1 from 10-1 to 10.5-1. Based on other modifications, gains of up to 40 rwhp can be expected. These are a great choice for naturally aspirated engines and applications where 75-150hp nitrous systems will be used. The Stage II bare heads feature our 5 angle 2.055”/1.57” valve job, hand blending, and custom honed bronze guides.

*Sold as Pair

Technical Specs:
Combustion Chamber: 64cc
Intake Runner: 227cc
Exhaust Runner: 70cc
Intake Valve: 2.055"
Exhaust Valve: 1.57"
Valve Guide Material: Manganese Bronze
Valve Job: 5-angle