KMJ Performance Premium Casting Cylinder Heads - Stage 1 + 600" Lift Valve Springs

KMJ Performance Small Block Chevy Cylinder Heads 

Casting Numbers: 441; 487; 126; 920; 993; 997

These premium casting heads are done in house at KMJ Performance. All heads are cleaned; thoroughly checked for imperfections and examined for wear and breakage.

*161cc Intake Port

*65cc Exhaust Port

*76cc Combustion Chamber

Features Include:

• Factory Hardened Seats

• 3 Angle Performance Valve Job

• Performance One Piece Stainless Valves -1.5std / 1.94std 4000 Series(recommended for up to 350 lbs of open pressure)

• New Elgin Valve Guides 

• .341 Soft Umbrella Seals

• New Heavy Duty Valve Spring Retainers - Heat treated; black oxide finish & 50% stronger than stock!

• New Quality Valve Locks for Hydraulic and Flat Tappet Camshafts - 7° Hardened Stamp Steel 11/32"

• Z-28 Performance Valve Springs(specifications below)