9sec Chip is doing it with Hemi heads. says its fine on the street(see the other thread posted to day). I agree, it will be tough with those heads. The good hemi heads flow in the 450 cfm range, and you need 400+ to get to 800 HP. I will let you know how my 540 w/B1 heads is on the street once we get it running. It has 12.5 CR, tho, so i will have to burn a 50/50 mix 110/93 for cruising around. Dyno HP was around 850 w/a custom grind 280 at .050 and .713 total lift w/ 1.7 rockers.