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There isn't much difference between the E and F. On some
cars I think the map sensor on the fuel injection is different.
The main difference is mostly in compression ratio, though.
The B20F can be made into most of a B20E just by milling down
the head until you get the B20E compression ratio. There were
suppose to be some porting differences between the E and F but
I think most of the power difference comes from the CR. The
cam and pistons are the same between the two.
The E did make it to america, but only in the first couple
years (1970 1800, 1971 1800 and 142e, I think).
chris
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