Quote Originally Posted by Bee's69camaro
The car has been 10.20's on a two stage 250 shot, well I would like to see it run around that fast with no power adders. It already has a roller cam and all the right parts to go fast I just wonder if these heads will let me go faster without the spray. I would really like to stay with the 427 only because a good chunk of money was spent on the rest of the bottom end and to have that stuff just sitting around would suck. Is the differance that great to move up to a 496 or 489 ?
yes your talking more CID like 69 more even one hp per cube69 hp more that is not hard to do more like a 100 hp over your build and the TQ would go up to it could be hard to get 10.20 even with your old parts on a 496 part s combo could be off for no shot on engine