You need to look at the pictures of Wade's heads that Charlie Buck did. You don't soften up those B-1 chambers it will be VERY timing sensitive. Also the right camshaft is a MUST. Nearly impossible to get the numbers you NEED on a standard BBM core. Needs to be 55mm
My B1 Original Heads were done by MCH, and were opened up to 76cc chambers and the quench pad was also angle cut for nitrous. With 13.5:1 compression and a 93 jet (250 HP) in an IS plate, that motor only liked 18 degrees of timing when going down the track.
Granted, a different cam could have changed that a bit. It was a nitrous cam, and worked well.
Also, that was at Bandimere where the air is thin. So, at sea level would have wanted even less timing.
I agree with Monte that if you don't soften the chambers it will be very timing sensitive. Well worth the money in my opinion.
Mine made 650 to the wheels on motor, and 905 on the 93 jet.
