Cylinder Head 44x37.5 94mm
AA PERFORMANCE. EACH. 501 SERIES. SINGLE HI-REV VALVE SPRINGS. This is a brand new set of 501 high performance cylinder heads for a VW Type 1, 2 or 3 dual port. Heads comes with stainless steel 44mm intake and a stainless steel 37.5mm exhaust valves, with harden keepers, chromoly retainers, and single high rev springs. They are ready to install.
The 501 series castings come STD with: Increased material at the intake surface giving you the ability to make much bigger ports . A modernized combustion chamber, for increased head flow & performance. 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 stop possible oil leaks. Long reach 3/4 inch spark plugs, to reduce the chance of cracking between the valve seat and plug. must be used with hardened lash caps as the valves are stainless steel.
Part #: AA50146094B
USD 412.32