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572 tall deck cam

Old 02-09-2020, 06:56 PM
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Default 572 tall deck cam

Time to replace cam and valve train on my 572 tall deck. 8.5:1 comp. Merlin heads 320cc intake, 119cc combustion chamber. Dart single plane intake 1050 holley carb., gaffrig. Dry to tip headers. Current cam is a comp cams 288ar8. 680 lift solid roller 288 in. 296ex. Duration, 108 lsa. Dyno results 693 tq. @ 4,500 rpm. 672 hp @ 5,400 rpm. Happy to stay in this hp tq. Range. And solid roller or hydraulic roller is fine. Looking for cam, spring, lifter suggestions. This is in my Formula 402sr1 big and heavvy
thanks guys

Last edited by chris302; 02-09-2020 at 06:58 PM.
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Old 02-10-2020, 10:24 AM
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why are you changing the cam and etc????? alot of hours???
i am running cam machine shop suggested. i guess shop has used before and like the cam
its an isky cam, red zones solid roller lifters, they , the shop , ordered all my parts,,as they know what will work.
140444861 heads, 380 runners,, they got the springs, so i dont know what they got,,,but they work..
cam is similar to yours 286 296 and 714 lift lobe center 114
547 's standard deck,,,10.3 srp pistons,,,single plane intake ,,,1050 dom's,,,old cmi split top headers...
i wish i had run motors on a dyno,,,but ,,,too late for that...
shop said motors should be around 675 hp.....
i also have an old heavy scarab...

good luck

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Old 02-10-2020, 10:47 AM
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Thanks Flashgordon, they were rebuilt and sat three yrs. before i bought and installed them last year found they had set one pushrod on top of the lifter instead of in the pocket. Damaged a lifter pushrod and rocker. While fixing that i


found the cam had significant wear and weak or incorrect springs. So before any major damage time to do it right.
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Old 02-10-2020, 10:54 AM
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hmmmm,,,well with what these motors cost or money we have in them,,,its best to never second guess anything.
just more info the shop i go to builts all hi perf stuff...cars and boats.
only thing they dont do ,,,is flow heads, they do the basic head work..
good luck....

Last edited by flashgordon; 02-10-2020 at 10:55 AM. Reason: spelling
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Old 02-10-2020, 11:45 AM
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I haven’t used them, but I like the idea of bushing lifters. Less weight and low or no fallout from a failure that could take out an engine.
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Old 02-10-2020, 01:58 PM
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That is a lot of duration (288/296) and it start to fall on it`s face at 5000rpm?
That thing should pull till 6500+ , wonder what`s going on there.
Mine is blown ,548ci. 247/254 , still making power at 6200, stalls at 6400 , starts to drop off at 6500rpm.





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Old 02-10-2020, 02:47 PM
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Originally Posted by ICDEDPPL View Post
That is a lot of duration (288/296) and it start to fall on it`s face at 5000rpm?
That thing should pull till 6500+ , wonder what`s going on there.
Mine is blown ,548ci. 247/254 , still making power at 6200, stalls at 6400 , starts to drop off at 6500rpm.
Any chance that's to .020 number, not the .050.
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Old 02-10-2020, 02:48 PM
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Is the cam bearing journal all chewed up or am I seeing things ?
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Old 02-10-2020, 02:59 PM
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254 ...262 at .050 lifter rise
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Old 02-10-2020, 03:53 PM
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Probably wouldn't be bad if it was a hydraulic roller on a 112.
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