Bongo- might be easier to play around with the head gasket thickness and shaving the head. Of course watching for valve clearance is part of the deal if its going to be really tight. Could play around with some pistons but I'm sure some flycutting would be in order. I was actually thinking about building a d13 and putting a z1 head onto it. Then some custom tuning would def have to be in order but I would think it would be awesome in a light crx. The z1 swaps in those already yield 60+mpg.
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Burn lean and prosper \\ //
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