I have a new set of the Dart heads and want to get them (or thinking about it) milled. 5.3 has 9.5:1 compression and would like maybe.........??? What are some of you guys out there milling your heads down to?? I'm going to run the a 222/224 duration .566int./.568exh. with the 1.75 rocker. Tell me what ya'll think.

James

 

You can bring the CR up to about 10.5:1 on pump gas before you will run into bad detonation problems, I'd have to say that's probably like a 52-54cc chamber on the 5.3, you'll have to pull 1-2º of timing at WOT but the CR bump will more than offset the timing loss