Ok so I am digging through all my engine stuff last night. These are parts I have had for over ten years and there is some stuff I cannot identify;
Two camshafts one has Americam #1 stamped in it. These cams were supposed to be Nissan option 1 and option 2 cams.
Next are two of the cylinder heads. The ported head has round ports but a combustion small combustion chamber like the GX head. The standard looking head has larger combustion chamber but oval ports.all the other heads I have are round port large combustion chamber
Can anybody tell me why the differances.

Tom Grossmann , Las Vegas.

PS I will have A12 GX manifold and carbs for sale anyone interested??