502 Series Performance Head W/ seats and guides 42 Intake 37.5 Exhaust black but you still have need

but you still have need for the timing function

Tips are 32mm in diameter

Torque (Part#: H-4351VW-B): 28 lb-ft (5/16" Bolts)

5 Float Check Valve

502 Series Performance Head W/ seats and guides 42 Intake 37.5 Exhaust black but you still have needMade from an AA 502 Series Casting, It is set up to build the performance Head of your needs. It Comes with Seats 42x37. 5, Guides, with a 12mm plug hole. The 502 Series comes with our Stage 2 porting with a modernized combustion chamber for increased head flow & performance. There is a second Full Fin, so you can Fly cut your heads deeper to achieve almost any desired Head CC volume needed. Blocked off rocker stud bosses, to eliminate the O ring and