(New) 356/912 Pair of WR Cylinder Heads - 1950-69

Product Description: Finally, an improved cast reproduction of the factory type 616 cylinder head. No more fixing cracks and modifying 50+ year old heat cycled original heads that will probably just crack again.  These new castings solve the 356/912 cylinder head problem with a replacement that looks and performs better than the original. Price is per pair.     Features: Cast just like the original heads but using a proprietary alloy and heat treat process that will not crack. The prototypes were extensively tested on the WR engine dyno and on the street. The flow through finning allows for cooling that is impossible with a CNC machined head.  The smaller DR6EA plug is 12mm x ¾” reach and allows for much more material around the valves. It is a commonly used plug size and is easily available. Four new plugs are supplied with each set of heads.  The stainless steel 8mm stem valves are 38mm intake and 34mm exhaust and are installed using a 5 angle valve job. The guides are silicon-bronz