Dads Barracuda

You don't mill Mopar heads to gain compression. You change pistons. To go from 7s to 9s in compression will require over .100" to be milled off the block face of the heads and a ton from the intake side. I don't understand why people insist on doing things the hard way. In another thread there's a guy askin if he can use old stock valve springs. Really? Everybody has the same internet. These are basic questions. Mopars came stock for the most part with dismal compression ratios. There are many nice affordable off the shelf pistons that will raise the compression pretty much to anything you want. Now as it is, you have a pair of heads that you will have to custom mill an intake for and use only on that particular motor. Stuff like this can easily be avoided by a little research. These aren't Chevys. They build a lot differently.