fontyyy wrote:
I remember talking to Andy about it and he reckoned back when Eric Gorr was doing this sort of thing that he reckoned you could go out that far as it cut into the RC valve too much.

When I spoke to Eric Gorr about this (about 10 years ago! ) I seem to recall he calculated max oversize would be 263cc (without attempting to modify the stroke) before running into port timing issues.

I know someone who persevered with an Eric Gorr oversize, and when it ran it ran strong, but it wasn't reliable. I built an MC18 motor for a friend in the states that had Eric Gorr 250 barrels, and that ran like a scalded cat! It was also reliable... but 250's usually are!
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Andy.
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