[Walt Fricke]

2.7 heads would, one would think, have a chamfer (or at least not have a bit of flat) to cover the 3mm extra width on each side. Wouldn't that produce a sort of wedge shaped opening all around? But the head and cylinder would still meet and seal beyond that with '84s, wouldn't they? And the old fat CE rings do their job?

Same with stock 2.4 heads reworked to run with 85, 88, 89, or anything in between done for a race motor.

This sounds like a question for one of the professional engine builders, who have seen all sorts of combinations.

Are these the heads and same size cylinders as before?