501 Series Performance Type 1 Head Bare No seats Type-3 This is a new set

This is a new set of 86mm Big Bore Porsche 356 or 912 Cast Iron Liners

This is a new set of VW 95

This is a brand new Set of 2 High Performance Cylinder Heads for a VW Type 4 & Porsche 914 1

Thread Size: 5/16

262°/262° Duration

501 Series Performance Type 1 Head Bare No seats Type-3 This is a new setAA 501 Series Casting, It is set up to build the performance Head of your needs. It Comes bare with a 12mm plug hole, and with out Seats or Guides. Giving you the the ability to build any possible combo Street Drag head you want. Seat Pockets start with the Stock 35. 5x32 valve size Configuration and can be machined up to the 44x37. 5mm The 501 Series Castings come STD with: Increasedmaterialat the intakesurfacegivingyou theabilityto make much bigger