Too much cam? - LT1 Intake
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 878
Likes: 2
From: BC
Too much cam? - LT1 Intake
I have a flat tappet block with 128 Alloy heads. I'm running 10.6:1 compression with an LT1 intake manifold and I'm going to be running a Nitrous system in the new future.
I have this cam availible to me for next to nothing... which is unusual here in the UK. But I think it may be too aggressive to use with a fuel injection setup? The seller says it makes great power from 2,500 to 6,500 which sounds good though?
Adv. Duration 268
Intake lift 0.534" Exhaust lift 0.524"
Spring pressure 125lbs @ 1.84" 305'lbs @ .5"
Intake opens 20 BTDC, closes 48 ATDC
Exhaust opens 53 BBDC, closes 9 BTDC
Duration @ 0.050" 248 intake, 242 exhaust
Lobe separation 108
Intake lobe lift 0.356" exhaust lobe lift 0.349
I have this cam availible to me for next to nothing... which is unusual here in the UK. But I think it may be too aggressive to use with a fuel injection setup? The seller says it makes great power from 2,500 to 6,500 which sounds good though?
Adv. Duration 268
Intake lift 0.534" Exhaust lift 0.524"
Spring pressure 125lbs @ 1.84" 305'lbs @ .5"
Intake opens 20 BTDC, closes 48 ATDC
Exhaust opens 53 BBDC, closes 9 BTDC
Duration @ 0.050" 248 intake, 242 exhaust
Lobe separation 108
Intake lobe lift 0.356" exhaust lobe lift 0.349
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Cams are fairly cheap and I would not recomend slaping one in just because it was next to nothing. You would be much better off spending a couple hundred bucks and getting the proper cam for your setup. The numbers seem off between adv and .050 duration, for example my CC 306 is 290/307 Adv and 230/244 @.050.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Another point is the tight LSA; 108. Guys who tune ECM/PCMs will probably tell you that when running a cam with that tight a LSA will make tuning a LOT harder.
Of course, there will always be someone who disagrees, (never fails) but I believe the majority of folks will recommend a LSA of at least 112. You could also give Alvin or Bryan at PCMFORLESS a call and get their input too.
If you check the websites of the two big cam companies, CompCams and Crane, I think you'll see that all of their cams designed for our fuel injected engines will be in that 112 or higher range.
Also, a cam with that much .050 duration will not create enough vacuum to allow the power brakes to work well, idle will be awful (my standard) and low end throttle response will be soft, and about non-existent.
I'd take a pass on that cam if the engine is going to see any street use.
Jake
Of course, there will always be someone who disagrees, (never fails) but I believe the majority of folks will recommend a LSA of at least 112. You could also give Alvin or Bryan at PCMFORLESS a call and get their input too.
If you check the websites of the two big cam companies, CompCams and Crane, I think you'll see that all of their cams designed for our fuel injected engines will be in that 112 or higher range.
Also, a cam with that much .050 duration will not create enough vacuum to allow the power brakes to work well, idle will be awful (my standard) and low end throttle response will be soft, and about non-existent.
I'd take a pass on that cam if the engine is going to see any street use.
Jake
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
That almost looks like one of those Comp "Thumper" cams (
). Dont think your heads could utilize that cam anyway, Id pass and go with somethign much more suited to your needs. Nothign worse than a car that sounds good but doesnt go nowhere.
). Dont think your heads could utilize that cam anyway, Id pass and go with somethign much more suited to your needs. Nothign worse than a car that sounds good but doesnt go nowhere.
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Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
that cam would be a screamer in a ''short track'' circle racer in a class limited to a holley 2-barrel racing carb...no power below 4000 rpm tho...would be interesting to see what it would do in an injected engine, price of a set of gaskets and a few hours to change if it doesn't do.
not guessing, won division championship (local circle) with one VERY similar a couple years ago.
not guessing, won division championship (local circle) with one VERY similar a couple years ago.
Last edited by redrose; Oct 9, 2007 at 06:30 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
