243 Heads... gain?
Stock 243 (LS6 Heads) on the cars I have done pick up 15 to 20 rwhp but it wont hurt if you touch up on the tune they dont like as much timing but it wont hurt the car to run it I did for a while on a couple of cars I have bought and fixed up and sold. It will depend on the set up in the car also. Its a really nice upgrade I think. Good Luck
20rwhp would be about right if you are just bolting them on. For the work of doing a head swap you could pick up some cnc ported ones for $500 more and maybe pick up 40 to 50 rwhp.
