How much will 4 cc difference in the combustion chamber effect compression. For example, a 58cc head will yeild a 9:1 compression ratio, what compression ratio will a 54cc head yeild. Thanks.
Do the math. If 58cc will give you 9:1 compression, that means that 58cc is 1/9 of the cylinder volume. Get the total cylinder volume and then divide by the smaller chamber volume, in this case 54.