502 Series Performance Head W/ seats and guides 42 Intake 37.5 Exhaust black 8L type4 casting with breather

8L type4 casting with breather using 8mm valvestems

The vibrator is screwed to the back of the speedometer housing

Part #008 911 90S JE

Extra thick flanges are surface ground to ensure flat sealing surface and finish ground on I

but you still have need for the timing function

502 Series Performance Head W/ seats and guides 42 Intake 37.5 Exhaust black 8L type4 casting with breatherMade 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