I did this swap and put in a very mild cam (one step from stock) and the to items lowered the compression to the point that a have less off the line than I started with. So the old heads are rebuilt and going back on the car. If I am wrong about this, someone please correct me as I would like to run the bigger valves. Charles _______________________________________________ Join Excite! - http://www.excite.com The most personalized portal on the Web!