Well here goes, I hope this post is a little bit fun.
These are all on GASOLINE, D-cam, car per your specs with the fancy transmission.
This seemed like a good time for yet another “Dueling Gonkulator” for cylinder heads.
Probably not as definitive as a dyno & timeslip series, but also slightly less costly.
I Gonkulated everything from the C7AE-A “Tiny Port” iron to Blair’s Pro Ports, as best I have info on all of them. The difference between heads (133 Ponies, 1.5 sec, and 15mph) is striking, and yet, it makes you realize that comparing BBM_CNC vs TFS_CNC is really a nit-pick – other considerations (cost, reliability, availability, compatibility) are bigger factors.
Starting with TFS heads, I took a look at what converters do in your 6r80 Gal. I’m not too familiar with that transmission, pretty fancy stuff.
Et mph 60m stall
12.16 120.33 4.3 1800
12.07 120.36 4.2 2000
11.95 120.41 4.1 2400
Not a huge effect of stall, so I’d try whatever’s in there. 1st gear is so steep – steeper than the old GM Hydramatic of the 1950s, so it doesn’t really mind the cam.
So I’ll Gonkulate with 1800 stall just in case it’s that low. Here are how all the heads compare.
I’m running all these with cutouts open, because, it sounds better and how else would you run the D-Cam?
I hope your track “allows” real sound – some of the wimpier tracks don’t like open headers any more unless there’s big money on the table.
I used total Wt=3750 for iron, Wt=3700 for aluminum with driver & tools. In all cases the CR is magically set to CR=11.4 which would of course require different pistons in many cases. All these heads are using the TFS Cleveland intake with adapter. For the MR, HR and TP heads it’s not even clear those would work that way or even work on a 428, but the magic of the Gonkulator allows us to try it just to compare the heads to each other.
In each case, I’m shifting the Gonkulator 400rpm above peak power.
Basically there’s 4 batches of heads.
Within a batch, they’re very nearly the same and nearly within the +/- 3% of the Gonkulator:
1960s grocery-store iron
1960s Hi-Po iron
1990s aluminum
2010s Hi-Po aluminum
I list the heads in order of “Ponies” (average of peak TQ & peak HP), the best street/strip metric I know of:
ET MPH 60ft 60m R TQ R HP Ponies Head
13.55 106.5 2.25 5.4 45 432 62 425 429 C7AE-A
13.54 106.7 2.26 5.4 45 431 62 427 429 C8AE-H
13.39 108.3 2.25 5.3 46 446 62 442 444 C4AE-G
12.98 112.0 2.19 4.9 46 482 63 504 480 C8OE-N
12.82 113.9 2.20 4.9 46 485 64 517 500 C5AF-F MR-F ***
12.73 114.6 2.18 4.8 46 496 65 528 512 C7OE-K TP ***
12.67 115.2 2.16 4.7 46 503 64 529 516 C4AF-F HR ***
12.61 115.7 2.16 4.7 47 499 65 538 518 Ed Out-of-Box
12.55 116.4 2.15 4.6 47 506 65 545 525 Ed Stage X
12.32 118.5 2.10 4.4 47 530 65 571 550 Survival Felony
12.22 119.5 2.08 4.4 47 541 65 582 561 BBM 438 RWHP
12.22 119.6 2.09 4.4 47 542 67 592 567 Felony CNC
12.22 119.6 2.10 4.4 47 539 68 599 568 Ed Stg III
12.16 120.3 2.08 4.2 46 550 66 595 572 TFS_CNC
12.16 120.3 2.08 4.3 46 549 67 599 573 BBM_CNC
12.09 121.0 2.07 4.3 47 555 67 610 582 Blair Pro Port
*** The astute reader will notice that it would be hard to run eg TP heads without a TP intake, and even hard to run them on a 428. The exhausts are either hitting the wall or very close to it. But let’s pretend – and in doing so, we can see that the TP heads and the old base Edel heads are just about equal. The Edel heads were a good start to the new era back in 1997 when they came out. But they’re outclassed today by everything that came after them.
By the way, the aluminum heads here do indeed come in well above that 425 REAR WHEEL hp, though you still lose a lot on the way from the old 1960s gross HP to rear wheel on a typical race day.
Hope this helps on your 63 Gal project, and hope it helps everyone look forward to the Dueling 390s this fall. That will be better than Football! Well, Werby’s Wife disagrees but I think so.
