[jarrington]

This is great info, Ken. I currently have an unmodified early #4 on my car, but since then I've acquired a late #6(?!?), which you don't have listed there. Any ideas what that might be? I think it's from a Euro 2L. Pic is attached

The motor is a nicely warmed over 2L with 10.4:1 pistons, Autodelta cams w/ 10.6 mm lift, and 40DCOE32s with 32mm chokes. I'm thinking the smaller ports on the early manifold are probably holding back the engine somewhat, so over the winter I plan on swapping over to the later manifold and possibly going to 33 or 34 mm chokes with appropriate jets / emulsion tubes / etc.

-Jason

 

[jarrington]

Hi Jason, thanks for your contribution. Can you measure the ports if it is as cast and can you determine any other differences from the other late manifolds I have listed.

Ciao

Ken

How are you measuring? On the carb side the ports are chamfered, are you measuring from the face or where the chamfer ends in the bore? I assume on the head side you're measuring horizontally?

-Jason