Who has a good cam recommendation for a 572 with indy 345 cnc 2.25 intake 181 exhaust heads. Indy tunnel ram with to alky 750 carbs. 14.1 compression with diamond flat tops. 4.500 bore 4.500 stroke. I have a set of 1.5 t&d or 1.6 T&D rockers i can use.

Race only setup in a dragster weighing 1955lbs with a 4.30 gear and 33.5 x16x16 tire.

Thanks in advance

Call Fast68Plymouth, Dwayne Porter. 802-951-1955

I don't have a recommendation, but that monster is going to need one big honkin' cam! sounds like an awesome, big power combination. GOod luck with it.

Select the cam and then get the converter built to work with that cam

I have 6 convertors from a supplier that i am lucky enough to get to gunnie pig. So convertor selection is not a problem. We pretty well know what each convertor does in many different usages already and can pretty much pick out which one to use to start with.

Do you know what engine RPM you want to shift at and what the RPM is at the stripe?

What size cam tunnel,and how often do you want to change springs? How much valve pocket do you have in the pistons, or can they be cut deeper?

Very good advise. Ron

This what I run. 15-1 572, ported -1. Comp; RX 1718 int lobe (285@.471"). XCX 1862 exh lobe (292@.471") ground on 112 LCA (gross lift .799"). Uses PAC 1224 spring @1.950. T&D paired rockers 1.7 ratio. We checked the last set of springs at 200 passes. No pressure loss, same as the new set. With 440-25 Indy cross ram and 2 Eddy 750's the car will run 9.1-9.2 145-146 in any weather at 3340lbs. Best of 9.00@150. Lash stays consistent.
Doug

Right now i shift at 7000 and cross about 6800. Somewhere close to that is kinda where i want to stay.

Thats with the convertor flashing at 6120 via the racepack.

The valve pockets are plenty deep.

The block is the older mopar mega block.

I make 350 passes or so a year so i do like something easy on the valve train.

I am still running the same the cam i had ground for my 528 years ago and then i switched to the 572 combos in 2011.

Just thought i would put the correct cam in it to make it a little more stout.

Want to be in the 4.70s in any weather instead of the 80s like it is now.

I'm guessing your cam tunnel is stock, so here's a stab. I'm thinking with that many inches, and those heads, your motor will peak around 6800-7000. I'd try this if you want to get after it. 288/302 on a 114. Keep the lobe to .5 since the core is small.

What are your current cam specs? If you want to cross the line with the same RPM as your current cam then you probably don't want to change the duration a bunch.

With 1.5 rockers it is

Intake lift 700 ... Lobe 4668
Exhaust lift 715 ... Lobe 4765

@50 Intake 286 and 109 ATDC
@50 Exhaust 306 and 115 BTDC

Advertised Duration 326 intake and 356 exhaust

With a STD cam core keep the lift reasonable. You didn't mention a rocker ratio but assume 1.5/1.6. We run a 572 in our Racetech, its been 4.60 here in Las Vegas. Id look similar to what's been posted FWIW here is what we had in ours 115 center, 283/299, .474/.475 with a 1.7 rocker gross lift at 806/808.

AL i have my older set of 1.5s and a brand new set of 1.6s .. Not sure which to use to be honest.

Those lobes were probably designed for someone, or a particular combination........ they’re not in the lobe catalog.

Yes that is the cam that was made for me years ago for the 528CID

Do you have flow numbers for the heads? I would think that those heads would flow pretty well up past 0.800 so if you have the budget to put more lift in the engine you might find some power there.

Seems to me your existing duration is roughly correct but you could probably pick up some power with more lift. However, adding more lift and keeping the same duration means that you are going to be using a more aggressive lobe which means everything gets beat on harder.

In my 514 race engine I use a Crane R282/481. That cam is 282/288 at 050 and has 0.481 lobes. With 1.70 rocker the gross lift is 0.817. That cam might be a touch small for what you are doing but I'm thinking it would make more power than what you have now without changing the peak rpm much. My 514 makes about 900 hp on the dyno with Indy EZ heads and a single Dominator. My compression is 15:1 so close to what you run but I'm 60 inches smaller and don't have the tunnel ram.

I assume you're running some sort of race header since it is a dragster? 2 1/4 pipes? 30 inches long? 4 inch collector?

We have never run our Racetech out the back door as my son is only allowed to go 7.50. We run it with 10 degrees of timing out of it and a small 1050 carb most all the time. The only time we ran it all out was in Salt Lake las year and he went 7.53 in 9200' DA. You don't NEED a ton of camshaft in a light dragster to get after it. We went 8.teens with a 446 in the same car here in Vegas with an OOTB -1 head and tiny roller on pump swill.