I have a '71 302 with 2bbl carb. It is stock. I am trying to determine the compression ratio, but everywhere I look (Motor's, Chilton, etc.) I seem to get different numbers. I think it's about 9.0:1 but what do you all think?

The heads are good and I don't want to mill them, but if the compression is below 9.0:1 then I might consider different head gaskets to bring it up a little bit. What gaskets do you all suggest. I think it has Felpro torque once gaskets now.

Thanks, Polkat

 

My interchange manual says 9.0 to 1

220 hp with 2bbl

 

With the gasoline quaility ever in doubt, I would leave it at 9:1

 

Thanks guys. 9.0 sounds good for todays gas and even for some mild enhancements. And you're right, with whats probably coming, who knows what gas will be like in only a few months!