Our custom 5 axis CNC machined new GM castings make these heads a must have for any performance oriented GM LS series engine. Custom designed runners flow up to 60 cfm over stock OEM versions. The 63cc chambers will increase the compression on a stock LS1 from 10-1 to 10.8-1. 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.
*Sold as Pair

Part Number: 198-2026

Technical Specs:

Combustion Chamber: 63cc
Intake Runner: 220cc
Exhaust Runner: 67cc
Intake Valve: 2.02" Valve Job
Exhaust Valve: 1.57" Valve Job
Max. Valve Spring Lift: 0.650"
Valve Guide Material: Manganese Bronze
Valve Job: 5-angle

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