Quote:
Originally posted by SteveMc:
So the answer is that compression ratio goes up a tenth of a point for .+.020" overbore and bout two tenths of a point for .+040" overbore. That's if I did the math right, anyway.
You're right, and that is one of the reasons there is a 1/2 point allowance in compression in IT - the other reason is that if you must have the head resurfaced as a part of a normal rebuild, you will gain a slight amount of compression. They figured .5 would be enough to handle rebuilds.