> I have heard that AMC offers the same head for both the 1.9 and 2.1.  Which
> means ..........they must compromise on the combustion chamber volume.
> I believe, that if you increase the bore of any engine...........and no
> other changes, you raise the compression ratio.
> This is why I suspect OE heads offer one for the 1.9 and for the 2.1 a 'C'
> suffix on the part number.
> This should also mean that if you put 2.1 heads on a 1.9 you'll have
> ..........think I have this right ...........a lower compression ratio then
> before.

I think the only changes between the 1.9 head and the 2.1 were
structural. According to the Pro Training Manual, the 2.1 simply has a
7mm longer stroke (94mm piston, so 4.7 * 4.7 * pi * .7cm * 4 cyl  =
.195 liters).

--
John Bange
'90 Vanagon - "Lastwagen"
'90 Vanagon GL - "Wiesel"