VW 1600 Based Type 1, 2 And 3 Complete 40 X 35.5 Dual Port Heads 85.5mm, Cut 90.5/92mm Or 94mm. Cooling air passages are clear as the original for the best cooling possible, designed like the original to last. New heads with new components, stainless steel valves, single HD springs, Chromoly retainers, hardened keepers and small (bottom) deflector tin.. 40mm intake with 35.5mm exhaust valves. 12mm, 3/4 inch spark plug holes. Cut to size. Sold each or in pairs.