Technical Specifications of...
Warhawk LS7X 12° Cylinder Heads

Material: 355-T6 alloy high density aluminum (.600" thick deck)
Valve Seats: Interlocking steel intake and exhaust seats
Valve Guides: Bronze
Valve Spring Seats: Machined for 1.550" springs (can go to 1.625”)
Intake Valve Size: 2.250"
Exhaust Valve Size: 1.625" (all stems are 5/16")
Valve Angle: 12° (same as rocker arm attachment)
Intake Runners: 285cc
Combustion Chambers: Choice of 64cc or 72cc
Spark Plugs:14mm, tapered seat, 750" reach. Accel # 526
Valve Cover Rails: Raised .600" to clear aftermarket rockers
Assemblies: Choice of 2 spring/valve packages (plus bare heads)