i have a dumb question ... if you take a stock 454 ( lets just say 8.5 to 1 compression) and then bore out the cylinder thirty thousands over, then reassemble with all the exact same parts, has the compression ratio changed because of the increased cylinder diameter ? :confused:
or is it so small of a change it doesnt matter? just curious.... to much time on my hands!:clonk:

Only the volume has changed.

You won't be able to use all the exact same parts. You'll need to go with some .30 over pistons to accomadate the larger cylinders. The choice of pistons is yours here. If you go with an identical piston to the one you're replacing then the compression ratio will be the same. Hope this answers your question.

i have a dumb question ... if you take a stock 454 ( lets just say 8.5 to 1 compression) and then bore out the cylinder thirty thousands over, then reassemble with all the exact same parts, has the compression ratio changed because of the increased cylinder diameter ? :confused:
or is it so small of a change it doesnt matter? just curious.... to much time on my hands!:clonk:

That is not a dumb question at all..Anytime you increase the swept volume of the cyl with no other changes will result in a higher CR.No different than doing it the other way around with thinner head gaskets or smaller combustion chambers.

i have a dumb question ... if you take a stock 454 ( lets just say 8.5 to 1 compression) and then bore out the cylinder thirty thousands over, then reassemble with all the exact same parts, has the compression ratio changed because of the increased cylinder diameter ? :confused:
or is it so small of a change it doesnt matter? just curious.... to much time on my hands!:clonk:
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You are correct, it will increase slightly assuming you use the exact same style of parts only in the correct oversize.
You are changing the swept volume by a few cubic inches.
It is not much though. on the order of a half tenth