Thanks for the info F5. Good stuff indeed. I'll discuss it with a few others but I'd say I'll probably aim around 1.2 to keep some clearance and stay on the safe side of things. It seems to be whats accepted around the place from those in the know. It sure sounds like you have some experience yourself in building race bikes! You blokes on the other side of the lake are well smart!
Stainless, the volumes on the S3 actually measure the same as the stock head (or at least it did on the 300 that I cc'd).
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