Help Gathering Info on Inherited Motor
From my read on your specs looks like .030 over bore. Stock bore is 4.32 your's is 4.35 putting it at .030 over bore.
Stroke looks stock at 3.750
Depending on what year 440 it was, 10.5:1 was normal stock. Looks like you have some high dome pistons there raising the compression ratio somewhere around 11.5:1 maybe more like 12:1
You can lower the compression by putting the thicker aftermarket head gaskets in it. Let's say stock head gaskets are .035 ths compressed, you can put .085 ths head gaskets in giving you a difference of .050 ths, reducing compression ratio and increasing chamber volume.
You have pretty good lift on that performance camshaft too .590 /590 as compared to 1970 stock 440 cam of .450/.458 lift.
Stock 440 cam lift:
Some of the engine specialists will probably chine in here to give you more info on what you have there.
From my read on your specs looks like .030 over bore. Stock bore is 4.32 your's is 4.35 putting it at .030 over bore.
Stroke looks stock at 3.750
Depending on what year 440 it was, 10.5:1 was normal stock. Looks like you have some high dome pistons there raising the compression ratio somewhere around 11.5:1 maybe more like 12:1
You can lower the compression by putting the thicker aftermarket head gaskets in it. Let's say stock head gaskets are .035 ths compressed, you can put .085 ths head gaskets in giving you a difference of .050 ths, reducing compression ratio and increasing chamber volume.
You have pretty good lift on that performance camshaft too .590 /590 as compared to 1970 stock 440 cam of .450/.458 lift.
Stock 440 cam lift:
Some of the engine specialists will probably chine in here to give you more info on what you have there.
