ported 906 heads....

there was quite good article in mopar muscle about porting BB heads(1999???), look at their web page. Two things: pocket porting(MP templates good) and short side roundness. Easy HP!!! Then if you have energy left, narrow the guide bosses(quite huge originally) and make corners bit rounder than in that picture(below the valve quide) else it makes turbulence behind the valve. Exhaust not that critical. And backcut valves(5minutes=few cfm). I Have now 70 cc 452 heads going on my engine with all those mods, flowed nicely. And new Comp XE274 cam, I heard its quite exellent.