501 Series Performance Head W/ seats and guides 40 Intake 35.5 Exhaust black The Compression ratio is 7

The Compression ratio is 7

And save time and Money by replacing all the major parts all at once

2:1 with the 70

(1) Black Cylinder Head Cover Dual Port 1-2 Side

OEM Part#: 211 301 265A

501 Series Performance Head W/ seats and guides 40 Intake 35.5 Exhaust black The Compression ratio is 7Made from an AA 501 Series Casting, It is set up to build the performance Head of your needs. It comes with Seats 40x35. 5, Guides, with a 12mm plug hole. 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