Just remembered this part:
Quote:
Originally posted on www.tunacan.net/t4/tour/heads.shtml
The small cylinder bore openings can create sealing issues, especially with higher than stock compression ratios. Flycutting the heads and using later model cylinders (and pistons) from a 1.8 can give you 100cc of displacement and better sealing.
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from type IV secrets revealed about the 1.7L Cylinders...