Does a .030 over amc 360 pick up a noticeable compression increase over a stock bore, and if so how much?
Does a .030 over amc 360 pick up a noticeable compression increase over a stock bore, and if so how much?
Overbore has nothing to do with compression. Compression is all in the piston and/or head design. If you use a stock style replacement piston, you will have stock compression. Some replacement pistons actually lose a bit of compression if you don't deck the block or mill the heads because they move the piston about .020" LOWER in the bore to allow for decking. A .030" overbore will gain you about 6 cubic inches of displacement.
Bob
tufcj
1969 AMX
1967 Rambler Rogue
If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
doesnt compression increase slightly because you are pushing more air and fuel into the same amount of volume in the head? provided you deck the block for 0 deck height.
You'll probably have LESS than you had before!Originally Posted by tufcj
ASE Master certified engine machinist, gas & diesel
The volume of the cylinder increases by less than 1 cubic inch, probably negligible in terms of compression increase.Originally Posted by ironman_gq
Bob
tufcj
1969 AMX
1967 Rambler Rogue
If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
You get a small bump if you are using the same dish the same compression height and the same valve relief but on a larger piston the dish diameter is wider to make up for this.
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