383 Build - Help!

If you don't mind, letting us know about where you are located might snag you a member who can help you out. A cheap plastic burette, marked in CC's is about all thats needed to CC a set of heads. I've seen closed chamber heads checked that were well into the mid 80's for CC's. It wouldn't be hard to check bore size. It could be .040" over, or that could be a casting number on the bottom. I don't recall ever seeing a piston stamped with it's diameter on the bottom, but maybe the KB 383 pistons are? The 460 Ferd ones I just looked at were stamped on the top. I'm not trying to beat you up about the compression, but you might be closer to 8.5 to 1 than you think. It's relatively easy to fix right now.