My combo: 511 12.5:1 with MW Edelbrock heads CNC ported flowing 350@.700. Indy 400-3 ported with and 1100 thumper Dominator. 8" vert 5400 stall, 4.10, 28" tire and 3380# foot brake. Current cam is a comp SFT 270/276 .645/.615 110. Ran a best od 10.06@134mph.
Looking at 2 different cams to go with 2 different cam matching theories.
First theory is that first 330ft at track are the most important, so I would think a torquer cam would be best, so here it is. Ultradyne 294/298 267/271 650/620 108 lash .016/.016(@.200 lift 185/188) my current cam is 180/186@.200
My second theory is why would low end grunt matter because the vert stalls at 5400 and never drops below 6000 going down the track. So, here's that cam, Comp 324/324 290/290 650/650 108 lash .028/.026 (@.200 lift 200/200). I was told this is an old HM cam. Street/strip deal.
The 290 sounds way over cammed with 12.5:1 . Jim who goes real fast on flat tappets says nothing over 270@50 or its over cammed with 12.5:1 and i'm sure he's correct in this. Just thought I might get a few opinions on this as i'm really sold on the NF904 cam.

Like the first one way better

Me too, just thought I would throw that huge one in there because I hear there are some 440 guys with 11:1 going fast with it.

Here is my cam for a very similar combo....

First is too small, second too big.......My [censored] box street car 470 runs a .680-.660 276-281 and is tame and street able as a kitten.......

I know at first glance the 267@50 looks small, but the at 50 is not the end of the story. You need to look at the @200 number. Tells what the cam is really doing. Tim said this one is as good or better than some roller cams and I’m using a 1.6 rocker on that too. I think I was over crammed at 270 with the lower compression, so want to be careful here. A genius cam designer once said its not the duration, but where it’s at that really matters. This 267 is 5* more at .200 than my previous 270 cam.

What is your compression?

you know its going to come down to testing and how your combination likes whichever cam .
I am at 272/272@0505 , .600 nett , 108 lobe separation .
I am a hair off where I thought I should be for my sixty , transbrake . But at around 400lbs heavier and 30"radial I feel mine is running fine .
You may even just need a bigger stall converter , mine is 6000 . It was speced as a 5700 by A1 when I had stock port heads and stalled right around that . TF270 heads , more power slightly bigger stall .


Tex

Dave are the lift numbers you posted with your 1.6 rockers?

1.6 / 1.5 combo. .016 lash puts intake at .633 actual and I think the exhaust was .615

If anyone wants to learn some interesting cam info, go over on speed talk and search UD Harold and read his post. You’ll find that picking a cam just by the @50 is not the way. You need to find the @200 as well and compare. I learned a bunch over there and still don’t know everything.

Safest way to be right on your cam is to call Dwayne with your combo and have him spec one.
Without trying to brag, my stuff has always ran how i expected it to right out of the gate, and not been underachieving, i don't think. . Dwayne has done/ specced all my cams. He is very smart. Really trust his judgement, and takes out the guesswork.
Cams are kinda mysterious. Its good having somebody that has it figured out
I remember yanking out a cam of his years ago, and replacing it with a cam a certain cam guru swore would pick up the combo. Slowed it down almost a tenth and a half.....learned then about avoiding a wide lsa cam in an NA deal with somewhat limited heads.. that was on a 112.

Yeah I had one of those Scott Brown cams too. It was a turd. Worst cam I ever had and I used to see a bunch of those for sale second hand. I currently have Dwaynes grind and it’s not a bad cam, but I think a little more aggressive and on a 108 is the answer. Mines on a 110.

Is there a reason you're not running more lift? My Indy headed small block is running .710/.719" at the retainers, 263/271 @ .050. I don't have the .200 numbers.

Hey Dave, what mufflers & type of exhaust are you running ? & have you uncapped it

Lol...
You knew who i was talking about. Too funny

I did too on my 408, but I had oil spray bars in the covers to make the springs live. That was a street/strip deal too and a roller. The lower lift is what was sped’d and I’m ok with it. I think going roller makes it easier to get big lift with duration. I assume yours is roller? If I do go roller and I will one day, I’m looking at 2 UD grinds that have .726” lift. Not really sure it’s needed to go fast thou as the guy that had these heads before me was going 9:80’s with a .620 roller.

Haha, yeah the 112 lobe sep being faster in a pump gas n/a deal was a joke. He should of put all his cams on a 110, would of been way more successful.

No mufflers at the track just 18” extensions.

Yeah, Tim was looking at bigger cams til I told him needs to work well with a tunnel ram. I have heard before you need to stay conservative in duration with a tunnel ram. Not sure it’s true, but looks like Tim thinks so.