Originally posted by ziggy12345
I just talked to the guy who runs the local model shop and he says a good guide is to have 0.001" head clearance for every 1% nitro above 16% so 16% is 0.016" where 25% is 0.025"
Is this a good guide?
Is a very conservative guide, 0.021" is fine for running a 30% Nitro fuel. Going down to 0.015 to 0.018 if you're going from 16 to 25%, read some posts before this regarding this issue.