Problems switching from a 1976 E21 head to a 1972 121 head?

[Guest Anonymous]

Are there any? The 121 head is off a tii.

[Guest Anonymous]

The pistons will have to be changed correct?

[skipsfcr]

'02 engines are equipped with there won't be any problem. Whay year is your car? We've rebuilt several '75 & '76 2002 engines with E21 cylinder heads...All have had flat top pistons installed stock. In that case you can use whatever head you want.

[BigDog]

With the flat top pistons, you're not going to see a performance increase by switching heads. Now if you wanted to put some higher compression thumpers in the bottom end, then you should switch heads...

What's your objective? Just to replace a cracked head? Or one with shot valve guides/seals? In that case use what ever you can find....

But if it's performance you're after, start looking at cams and pistons!

Good Luck.

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BigDog

'76 2002 318i head

[Guest Anonymous]

tapped for a mechanical fuel pump, so you'll either have to do the machine work or convert to an electric fuel pump...