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If you are looking for an alternate piston than an Alfa you can use Nissan L28+1mm oversize pistons. They have small dish in the top and depending on the valve diameter on the inlet side, you may not have to releive the piston. these pistons are also lighter and less expensive than Alfa pistons. Pistons fit an 87mm dia. bore. Gudgeon pin is the same dia. and lighter than the Alfa pin. When i mentioned decking the block, which is just machining it, I think this is preferred because if you take 3mm off the head you could be getting really close to the water jacket at certain places on the head. The 1.5 heads seem to have enough material around the combustion chamber area to allow for 3.5mm of material to be machined out. The attached photo is of a 1.5 head of which I have done a couple without a problem. Just keep experimenting, there are lots of gains to be had from these icrediable little engines. Bob
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