What I am itching to know is if these heads will support an honest 650 ponies with a good non exotic roller cam shortblock under them 400+ inch 4 inch motor...
If so

If not.....


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8