Performance Head W/ seats and guides 42 Intake 37.5 Exhaust
031 501 440Made from an AA 501 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 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.
Casting: AA 501
Valve Size: 42x37.5
Head Bore: 85.5
Plug Size: 12mm (Replacement NGK Number is D8EA)
Shipping policy
We strive to get your product to you as soon as possible! All items in stock will ship same day handling time. However, if a product isn't in stock it'll be up to 8 business days handling time as we will have to place a special order for you.
If you have any questions about our shipping process or want to double-check the status of a stock item call us at 352-234-6235.
All Vintage Speed orders unless in stock will take 4-8 weeks to come in. Please call to check stock.
All MST orders are made when ordered and drop shipped, these orders can take 3 weeks to ship.
All policies subject to change.