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choose which cam
#576417
01/07/10 11:56 PM
01/07/10 11:56 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
OP
master
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OP
master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Both are solid roller cams. Camshaft A 286°/286°@.050 .500 lobe lift 104 LSA probably installed at 102-104 ICL
Camshaft B 290°/300° .477/.509 lobe lift 112 LSA probably install it at 106-108 ICL
Engine is my Hemi 572" 4.5 bore x 4.5 stroke 13.75:1 compression head flows well for stock heads 450-460 CFM at .700 lift Cross Ram intake with 850-950 DP Holley carbs.
The car has everything a race car should 5500+ converter, 4.88 gears..but on the porky side of 3500+lbs.
The Camshaft A might present a valve to valve problem, which can be a bunch of added problems, machine work and $$ to resolve.
With Camshaft B valve to valve clearance probably wont be a problem. I wish the cam was about 5-6 deg smaller on both intake and exh lobes. This cam would be a good choice to send in for a regrind..I have spoken to Comp, and have a few lobes in mind.
how would the engine respond diff to each cam? I figure the first cam would have better mid range power, with a pretty narrow power band. The 2nd cam looks pretty good, but kinda long in duration. If I ran it I would advance the cam maybe as much as 6 deg, and run lash on the loose side.
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: choose which cam
[Re: Bob_Coomer]
#576418
01/08/10 12:12 AM
01/08/10 12:12 AM
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Joined: Aug 2005
Posts: 761 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 761
Southington Ct.
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Well, My opinion would be cam B. I sa this because of two reasons. 1 - The larger LSA wil probably run cleaner and idle beter. 2 - Although there isn't enough info, it would be my guess that cam B may have a less agressive lift rate and may be beter on springs. The duration is larger without much increase in lobe lift. It may become more obvious if you hade duration numbers at .200 lift. If they are comp cams lobes, there should be lobe numbers on the back of the cam. Very useful to identify the lobes and lift rate profiles. Allan G.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: choose which cam
[Re: Bob_Coomer]
#576421
01/08/10 10:37 AM
01/08/10 10:37 AM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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I'm no expert but both those cams seem kinda weak for such a big inch motor...a Hemi at that. With that stall I'd probably look for something in the 600 lift range.**** whoops lobe lift**** carry on.
Last edited by SWINGIN\'72; 01/08/10 10:38 AM.
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