Rato R500D Cylinder Head Bare Casting - Fits GX390/420/440/460/500cc Engines

Rato R500D Cylinder Head Bare Casting - Fits GX390/420/440/460/500cc Engines

Does not fit R500-V (Duromax 500)

Includes steel seats and guides

Uses 5.5mm stem valves and shaft mount rockers

Has GX390 style 53mm intake flange stud pattern

Hemispherical chamber