Originally Posted by Cab_Burge
One set of heads I've used from Dart where the D4 heads, I was not impress with the results on that motor with those heads down
I don't remember the casting numbers now, sorry blush


The D-4 heads were cast iron, raised exhaust port and for NASCAR racing. I think the nitro monkeys used them in the 1970s as well.

Floyd Lippencott IV