AFR Heads
Those two sets of heads were ported by household name Mopar head porters. Either of which you are very familiar with.
Btw, one of those sets I ran, a little later on, with a bit more camshaft, those heads went 140 mph at 3320 on super stock springs. Not too terrible, I don’t think. Not many have done much better
On how many inches? Just curious.
All I’m saying is I did my personal heads back in 2002. They went 325 on my bench and 355 on a Superflow bench about 2 miles from my house.
That engine made 715 hp at 8500 on 340 inches.
That’s 2.1 hp/cid and I did not like the manifold. I had plans to change it but I just got tired of the grind (no pun intended) of working 40 hours a week on other people’s **** and 30 hours a week on mine.
Had I kept at it, I’d say I was 15-20 down just on the intake. The M1 W5 tunnel ram is a joke compared to the Pro Dominator.
And that was on alcohol. I had to use an oil that was another 10 down on what I wanted to use but couldn’t because of the methanol.
And I know, I know for a fact I was giving up power at peak torque with the MFI I was using.
And sadly, it was down at peak because of the MFI. After I did the math I realized I could make way more power at peak and under the curve if I went to two 1050 carbs and put it on gasoline.
It’s very hard to get rid of all the fuel at 8500 you don’t need and not kick the rods out in the gear changes because the mechanical check valves react far too slow. They hang open too long.
The rpm drops, the pressure drops, I’d have at least one bypass open that shouldn’t be and it would get lean and take a tip off a plug.
I suppose EFI systems today could manage that far better and it may be easier to do with EFI.
What I know 22 years later is far more than I knew then.
That’s how I know I could take a set of W5 heads and get 380. All day long. That’s about 760 hp. If I can make it burn the fuel well it would go over that.
I’d do a 4.2 x 3.79 engine. It would make peak power at 7500ish and shift at 8k or a bit more.
That’s 421 inches and I think it would tickle 800. If I nutted up and made it make power at 8k it would certainly go over 800.
I’m just not sure I can get enough area to shorten the induction enough to make it make power up there will all those inches.
If I live another 20 years I would hope I could do better than I can do today.
If I live that long but I doubt I have 20 left.