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Re: Would a B21/23 head fit on a B20? 120-130

posted by  someone claiming to be Bram Smits on  Thu May 17 21:35 CST 2001 [RELATED]

While the block's similar enough that I'ld imagine you'ld eventually be able to bolt it on, I'm not at all sure it's a good idea.

First of all it's an overhead cam head and an overhead valve engine, so you'ld have to engineer some way to drive the camshaft in a meaningful way. Once you've taken that hurdle there are still some minor issues like the bore size being different, probably some oil and coolant passages that don't line up, the fact that your combustion chamber shape and compression will probably be screwed up, the head being bored for metric bolts and the block requiring UNF, finding a jet/needle combo that works on this hybrid, and building a set of custom manifolds.

As an engineering challenge you'ld have a winner. From a sensible point of view, fitting in a complete b23 or B230 or even a V8 would probably be easier and cheaper.

Bram





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