Stock Head W/ seats and guides 40mm Intake 35.5mm Exhaust
031 500 420AA 500 Series Casting With seats and guides 40mm Intake 35.5mm Exhaust, It is set up to build the performance Head of your needs.
The 500 Series Castings come STD with: Clean flowing cooling vanes, for maximum cooling through the head, and around the intake ports for increased HP and over all cooling. 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 500
Valve Size: N/A
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.