Now that I sent that reply, I must say that I now realize (from the subject
line... I gotta start reading those) that my assumption is wrong. Since
it is obvious that you are working on a 1296, you have the following options.
1. Rebuild the 1500 and shave it down to achieve the desired compression ratio
(if it has not already been done).
2. Rebuild the 1296 one and use it as is.
Note: The first option will provide the best performance since it has larger
valves. Compare the depth of the combustion chambers on the two heads
to see if the 1500 one has been shaved down. It is easy to see the difference
if both are stock.
Cheers,
Joe
Joe Curry wrote:
>
> John,
> I am assuming that you are working on a 1500.
>
> The first head (515573) is for a 1500 and will work on a 1500 .
>
> The other one (307871) is from a Mk3 1300 engine and while it will fit ok,
>you will find yourself with a big problem of increased compression ratio
> because of the smaller combustion chambers. If you have easy access to very
>High octane AvGas or racing fuel, you might get away with it, but If you
> are indeed working on a 1500, just rebuild the 515573 and save yourself some
>severe headaches.
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