Technical Specifications of...
Warhawk LS1X 15° Cylinder Heads

Material: 355-T6 alloy high density aluminum (.600" thick deck)
Valve Seats: Steel intake, hardened steel exhaust
Valve Guides: Bronze
Valve Spring Seats: Machined for 1.550" springs
Intake Valve Size: 2.080"

Exhaust Valve Size: 1.600" (all stems are 5/16")
Valve Angle: 15° (same as rocker arm studs)
Intake Runners: 235cc
Combustion Chambers: Choice of 64cc or 72cc
Spark Plugs: 14mm, tapered seat, 750" reach. Accel # 526
Valve Cover Rails: Raised .300" to clear aftermarket rockers
Assemblies: Choice of 2 spring/valve packages (plus bare heads)