Help with cam selection for my lm7
02-28-2015, 01:10 PM
#1
Staging Lane
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Help with cam selection for my lm7
Hey guys! I need a recommendation for what cam to get for my LM7! I have a 2004 Silverado with and intake and 3" exhaust, STFTW tune, 4l80 transmission, 2800 stall, and 4:56 gearing in a 10 bolt rear end pushing 35" tires on my Long traveled Silverado! I feel like I have lost some of my torque and I want it back! Once it gets up and goes it does real good in a 1-2 shift(50mph) and then 2-3(70mph) acceleration dies off and 3-4 it's just boring. I need a little more get up and go off the line and then some help after shifting to 3rd and 4th. Also keep in mind I'm in California and dont want to have to pay to get an illegal smog done if I don't have to! Thanks for any input.
02-28-2015, 08:54 PM
#2
Something in a 218* duration with .500 to .570 lift and about a 114-116 LSA would give you more power in the RPM range you're running at. Anything larger is going to shift the powerband higher and reduce the torque under 3000 RPM. Adding compression and LT headers (if legal) would help a whole lot for adding torque.
You want more power off the line and shifting into OD, both situations where the engine RPMs are around 1400-2000 RPM. At that RPM, compression, headers and cam lift predominates when it comes to torque production.
If you increase compression to 10:1, a cam 15-25 degrees duration larger (than stock) will idle smoother, retain the low-end torque you have now and show larger gains in the cam's intended RPM range. You can go to 10.5:1 if you're willing to run 91 octane gas and cool plugs. Resist the urge to over-cam! Sure you can put a big cam and stall, but you lose low-end torque and hurt the truck's ability to tow or haul.
You want more power off the line and shifting into OD, both situations where the engine RPMs are around 1400-2000 RPM. At that RPM, compression, headers and cam lift predominates when it comes to torque production.
If you increase compression to 10:1, a cam 15-25 degrees duration larger (than stock) will idle smoother, retain the low-end torque you have now and show larger gains in the cam's intended RPM range. You can go to 10.5:1 if you're willing to run 91 octane gas and cool plugs. Resist the urge to over-cam! Sure you can put a big cam and stall, but you lose low-end torque and hurt the truck's ability to tow or haul.
Last edited by Chiphead; 02-28-2015 at 09:08 PM.
03-01-2015, 02:47 AM
#3
Staging Lane
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Something in a 218* duration with .500 to .570 lift and about a 114-116 LSA would give you more power in the RPM range you're running at. Anything larger is going to shift the powerband higher and reduce the torque under 3000 RPM. Adding compression and LT headers (if legal) would help a whole lot for adding torque.
You want more power off the line and shifting into OD, both situations where the engine RPMs are around 1400-2000 RPM. At that RPM, compression, headers and cam lift predominates when it comes to torque production.
If you increase compression to 10:1, a cam 15-25 degrees duration larger (than stock) will idle smoother, retain the low-end torque you have now and show larger gains in the cam's intended RPM range. You can go to 10.5:1 if you're willing to run 91 octane gas and cool plugs. Resist the urge to over-cam! Sure you can put a big cam and stall, but you lose low-end torque and hurt the truck's ability to tow or haul.
You want more power off the line and shifting into OD, both situations where the engine RPMs are around 1400-2000 RPM. At that RPM, compression, headers and cam lift predominates when it comes to torque production.
If you increase compression to 10:1, a cam 15-25 degrees duration larger (than stock) will idle smoother, retain the low-end torque you have now and show larger gains in the cam's intended RPM range. You can go to 10.5:1 if you're willing to run 91 octane gas and cool plugs. Resist the urge to over-cam! Sure you can put a big cam and stall, but you lose low-end torque and hurt the truck's ability to tow or haul.
03-01-2015, 07:35 PM
#5
TECH Fanatic
I would wait till you get a LQ4
I have been down this road before with doing a bunch of different setups with a 5.3 before I stepped up to a 6L.
The 6L alone will help with the torque down low and help make it pull harder up top.
like mentioned compression really helps with that low end torque.
I cant really help you with cam selections as I run a lot more gear and a lot more converter then you so I am able to run a lot more cam.
I haven't got to try the 408 yet but cant wait to
I have been down this road before with doing a bunch of different setups with a 5.3 before I stepped up to a 6L.
The 6L alone will help with the torque down low and help make it pull harder up top.
like mentioned compression really helps with that low end torque.
I cant really help you with cam selections as I run a lot more gear and a lot more converter then you so I am able to run a lot more cam.
I haven't got to try the 408 yet but cant wait to
03-02-2015, 02:05 AM
#7
Staging Lane
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Yeah I think I'm gonna hold off and just wait for a good lq4 to pop up and then cam it and throw some ls6 heads on it with a trailblazer ss intake is what I've been told to do!
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