Cylinder head Questions

[anders]

Interesting info. Do you think it applies to the D24/D24T as well?
So here is what I know: All 11mm D24 heads have the 32mm chambers in them. When they switched to 12mm in 82 they used 30mm chambers. All D24T heads in the US got the 30mm chambers. My greenbook lists non-US spec D24T's having the 32mm chambers.
Can someone here with a non-US 12mm Mechanical D24T head with the "32mm" chambers post there casting number?

[ngoma]

I think there are quite a few similarities between them. For ex. the NA versions had the larger precups.