4.8L Cam Question

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Originally Posted by GasGuzzler

Out of the 4 vids, I only watched the 405 hp Camaro. To me it sounds like a bigger than stock cam with no tuning. You want it to sound like that or run good?

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I want it to sound like that. I want the big lope!!! I currently have a Wheatley tune. So I will have Charley re-tune it when I figure out what cam and stall converter I want to go with. So it will sound good and run good! One is no good without the other!

You won't find many off-the-shelf small cams with a big lope, so you may want to go with a custom grind. If so, go here:

Comp Cams Custom-Grind LS1 Camshaft

and do this:

Intake: 212 .558" XE
Exhaust 224 .568" XE
LSA: 110
ICL: 110

This will give you a healthy lope and perform well in your truck. Comp doesn't charge more for a custom grind and only takes a few days to grind and ship directly to you. I would target the stall in the 2800-3200 range.

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Originally Posted by Madd Maxx

You won't find many off-the-shelf small cams with a big lope, so you may want to go with a custom grind. If so, go here:

Comp Cams Custom-Grind LS1 Camshaft

and do this:

Intake: 212 .558" XE
Exhaust 224 .568" XE
LSA: 110
ICL: 110

This will give you a healthy lope and perform well in your truck. Comp doesn't charge more for a custom grind and only takes a few days to grind and ship directly to you. I would target the stall in the 2800-3200 range.

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Thanks man!!! That is the most straight forward to the point perfect answer to my question.

Won't a smaller LSA help the powerband get up sooner? i.e. a 112 will make power sooner than a 116 with the same duration and lift?

Unless you have a turbo you want to build boost or N20 that benefits from the higher peak cylinder pressure of the wider split. That 212/224 on a 110 will have a lope for sure.

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Originally Posted by KHester84

Won't a smaller LSA help the powerband get up sooner? i.e. a 112 will make power sooner than a 116 with the same duration and lift?

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This will be the case if the smaller LSA results in the intake valve opening and closing sooner. If the smaller LSA is a result of the exhaust valve opening and closing later, then no, the powerband won't get up sooner. In fact, you would lose low-end power since the increased overlap would bleed off cylinder pressure in the lower RPM range. This is why cam manufacturers recommend higher static compression on some of their grinds.

Generally speaking, for two cams with the same I/E durations, the cam with the narrower LSA will will max out a little sooner and be a little peakier than a cam with a wider LSA, which will wind a little higher and have a broader torque curve. This assumes that the LSA differences were caused by moving both intake and exhaust centerlines the same.

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Originally Posted by Madd Maxx

This will be the case if the smaller LSA results in the intake valve opening and closing sooner. If the smaller LSA is a result of the exhaust valve opening and closing later, then no, the powerband won't get up sooner. In fact, you would lose low-end power since the increased overlap would bleed off cylinder pressure in the lower RPM range. This is why cam manufacturers recommend higher static compression on some of their grinds.

Generally speaking, for two cams with the same I/E durations, the cam with the narrower LSA will will max out a little sooner and be a little peakier than a cam with a wider LSA, which will wind a little higher and have a broader torque curve. This assumes that the LSA differences were caused by moving both intake and exhaust centerlines the same.

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:thumb:

What do you guys think about this set up? MS4 cam(239/242 .649"/.609 111 LSA) and 3500 stall
Go big or go home right?

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Originally Posted by Ghost04

What do you guys think about this set up? MS4 cam(239/242 .649"/.609 111 LSA) and 3500 stall
Go big or go home right?

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Not even close to what you need....Over camming a heavy truck with a stock compression 4.8 would get very old quick!!.....don't let the temptation of "going big or go home" be the deciding factor for chosing a cam... look around at the FTL and see what some of the other 4.8's are running..and take in consideration their other mods..if you go with a decent sz cam expect to be putting some gears out back and definantly a new stall....which either would probably be a good first mod anyways... my cam with stock gears and stall turned my truck into a turd off the line but screamed on the top in.... running 2.4 60' won't impress the ladies at the track...my cam which is a 224/220 581/581 112* doesn't wake up untill around 4000, which is fine at the track but not the best for the street...your doing the right by asking questions though.

Quote:

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Originally Posted by Madd Maxx

This will be the case if the smaller LSA results in the intake valve opening and closing sooner. If the smaller LSA is a result of the exhaust valve opening and closing later, then no, the powerband won't get up sooner. In fact, you would lose low-end power since the increased overlap would bleed off cylinder pressure in the lower RPM range. This is why cam manufacturers recommend higher static compression on some of their grinds.

Generally speaking, for two cams with the same I/E durations, the cam with the narrower LSA will will max out a little sooner and be a little peakier than a cam with a wider LSA, which will wind a little higher and have a broader torque curve. This assumes that the LSA differences were caused by moving both intake and exhaust centerlines the same.

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My truck has quite a bit of top end now. How do I determine where the LSA puts the opening and closing of the int./exh. valves? I want to perk up the lower end. When I launch my truck now it takes the motor a while to wind up. Once it gets up in the higher rpm range it really wakes up!