Re: 572 cam recommendation
[Re: 301v]
#2535603
08/13/18 01:37 PM
08/13/18 01:37 PM
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Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
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Marion, South Carolina [><]
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Call Fast68Plymouth, Dwayne Porter. 802-951-1955
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 572 cam recommendation
[Re: 301v]
#2535664
08/13/18 03:20 PM
08/13/18 03:20 PM
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Joined: Jan 2003
Posts: 7,521 Minnesota
Hemi_Joel
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master
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Posts: 7,521
Minnesota
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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.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: 572 cam recommendation
[Re: 301v]
#2535708
08/13/18 04:38 PM
08/13/18 04:38 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
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I Win
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Posts: 43,719
Bend,OR USA
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Last edited by Cab_Burge; 08/13/18 04:39 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 572 cam recommendation
[Re: 301v]
#2536026
08/14/18 07:22 AM
08/14/18 07:22 AM
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Joined: Mar 2006
Posts: 9,973 MI, usa
dvw
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master
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MI, usa
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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
Last edited by dvw; 08/16/18 09:48 PM.
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Re: 572 cam recommendation
[Re: AndyF]
#2536045
08/14/18 09:46 AM
08/14/18 09:46 AM
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Joined: Sep 2017
Posts: 41 Kentucky
301v
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Kentucky
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Do you know what engine RPM you want to shift at and what the RPM is at the stripe? 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.
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Re: 572 cam recommendation
[Re: AndyF]
#2536129
08/14/18 01:00 PM
08/14/18 01:00 PM
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Joined: Sep 2017
Posts: 41 Kentucky
301v
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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
Last edited by 301v; 08/14/18 01:01 PM.
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Re: 572 cam recommendation
[Re: 301v]
#2536132
08/14/18 01:04 PM
08/14/18 01:04 PM
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Joined: Jan 2003
Posts: 19,537 Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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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.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 572 cam recommendation
[Re: 301v]
#2536156
08/14/18 01:58 PM
08/14/18 01:58 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
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I Live Here
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Those lobes were probably designed for someone, or a particular combination........ they’re not in the lobe catalog.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 572 cam recommendation
[Re: 301v]
#2536214
08/14/18 03:30 PM
08/14/18 03:30 PM
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Joined: Jan 2003
Posts: 31,200 Oregon
AndyF
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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?
Last edited by AndyF; 08/14/18 03:31 PM.
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Re: 572 cam recommendation
[Re: 301v]
#2536219
08/14/18 03:37 PM
08/14/18 03:37 PM
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Joined: Jan 2003
Posts: 19,537 Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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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.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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