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<2002><320>Difference between heads



Howdy all,

I was wondering if anyone could shed some light on the
differences between the following heads:

121 - Early '02
E12 - Later '02
E21 - 320

The E21 looks like it will bolt directly to the '74
bottom end, but I'm just wondering if this will gain
me any power at all.  The good news is, the E21 head
is in my possession.

TIA!
Steve
'74 BMW 2002
'73 Land Rover Series III SWB
'95 Mazda Miata
'00 Acura Integra Type-R #634

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