I have the following ported GX cylinder heads for sale. [I will try to post a picture or a link to pictures.]

ZEK001 SOLD

ZEK002 is a complete GX cylinder head starting with a new GX head. It has 8mm stem diameter stainless steel valves that are 38mm/30mm. The head is unmilled at 2.912" thick. The ports have not been ported as you can still see the casting marks. It has dual Datsun Competition springs and slightly used Datsun competition aluminum valve spring retainers. $750 USD.

ZEK004 is a complete GX cylinder head that is used in running condition as removed from a race engine. It has a PINHOLE WATER LEAK near the top of the cylinder head near the #3 cylinder water plug. The valves are titanium 8mm stem diameter, 39mm and 33mm. It has Crower titanium valve spring retainers and dual competition valve springs. It is a complete cylinder head that was ported and enlarged. Normally without the pinhole leak $1200 USD. With the pinhole leak $800 USD.

ZEK003 is a complete GX cylinder head that is fresh from the machine shop after a race season. Valves are 8mm stem stainless steel, 40mm and 32mm diameter. Retainers are titanium Crower. Dual springs are Elgin cam springs. Thickness of the head is 2.845" and was originally build by Comptech Machine in USA. $1250 USD.

Email is the best way to contact me. Peter
PeterZekert (at) Juno (dot) com