I've got a little info on this in my thread S3 250 Cyl conversion. I will be having a look at advancing my timing some more to get some more angry into the bike.
Re the S3 head you mentioned earlier. Its not really a fix in terms of correcting squish. They use the same volume chamber with variable squish heights to increase compression. Same way you would with the stock head by machining the mating surface only. Issue is that you still can't get the squish where it needs to be without pushing the compression ratio through the roof!
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