I suppose it's the 471 cubes with standard port heads with gasket match ports, pretty small duration 264-268 108 lsa sft cam .660-.680 lift
It was making 660 at 6800
We could run it out to 7000 and it would still be making 650 HP but I don't really see that as necessary.
I am happy with what it's doing and it's right at my goal for et and mph.
Which is 10.00s and just under 135