Quote:

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.040 over bore 440, 906 heads, .020 head gasket,
flat top pistons .120 in the hole.

Estimates appreciated.
Thanks!

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You really need to CC at least one chamber in each head to find out what CC heads your working with I've seen supposidly stock uncut 906 heads have 91.+ CC in them with the carbon removed I've also seen 4.3 CC varience in chamber sizes on the same head, same differences on the other head with the thickness within .003 on both heads on both ends of those heads Once you get a idea on the CC size you have go to United Machines web site , AKA KB Pistons, Silvolite and click on there calculator tab and go to the compression ratio calculator and plug in your numbers to get a idea what you have on the compression ratio with your pistons and the specs. you put on here Let us know your results