.020 over 273

Great guys, thanks for the info, very helpful.
Hey has anyone used these new repro super thin (0.25) headgaskets? How much extra compression will it make and is it worth th $80 bucks they charge on ebay??

Give us a link on those. The best ones are from Cometic. They are multi-layer steel and you can order them with the proper bore size. You can gain a half point of compression over Fel Pro Permatorque Blue gaskets. toolman