240+ cam guys
240+ cam guys I've got a 240/240 .635 112 Lazer Cam that Im thinking about running. Obviously Im gonna have low end issues being about 1k LB heavier than you guys but I just wanna know what your guys' opinions on donkey dick cams are. I will be running the stock converter (4L80e) for awhile and 3.73 gears (posi on the way). Just want some input.. my tuner will hate me but I think I wanna do it. Thanks 
If it is a 4.8 liter then I think that cam is waaaaayyyyy too big! You've got to think your comparing this against a much lighter car...with a MUCH larger engine. Even people with a cam this large in their car sometimes complain about no bottom end and it will prob bareley even move with the stock converter as for the gears prob at least a 4:30. But like they say..Go big or go home!
read my sig... my motor is bigger than yours.
Anyone else? I realize low end is gonna be ridiculous. IIRC the range on it is something like 2k-2500 up to about 6200 RPM.
I know low end is gonna suck but is it going to be completely unbearable?
Anyone else? I realize low end is gonna be ridiculous. IIRC the range on it is something like 2k-2500 up to about 6200 RPM.
I know low end is gonna suck but is it going to be completely unbearable?
its hard for me to say. i have a t-rex cam in my car and its not intolerable. but i also have 6 speeds and 4.56 gears... i LOVE the top end that it comes with, but you do lose a lot down low.
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With a competent tuner it shouldn't be unbearable.
Unless you are running a really short tire, that cam with a stock 4L80 trans, stock converter and 3.73's in a heavy truck is a bad idea.
Will you be able to live with it? Possibly/Probably
Will a good tuner go a long way toward making it better? Absolutley
But the bottom line is that is totally the wrong cam for your application on so many levels. You would be better off selling it and getting something that makes way more torque - lose about 15-20 degrees duration.
If you insist on running that cam, start shopping around for a 3000+ stall converter, look for some 4.30 or 4.56 gears, and be preparred to reach single digit fuel economy numbers.
Will you be able to live with it? Possibly/Probably
Will a good tuner go a long way toward making it better? Absolutley
But the bottom line is that is totally the wrong cam for your application on so many levels. You would be better off selling it and getting something that makes way more torque - lose about 15-20 degrees duration.
If you insist on running that cam, start shopping around for a 3000+ stall converter, look for some 4.30 or 4.56 gears, and be preparred to reach single digit fuel economy numbers.
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No, its a TERRIBLE idea. Its all about combination and that is about as wrong as it can get for you.
If you can make it work or not is irrelevant, its just not even close to a good cam for you. Forget about that cam.
Ive got an LQ9 in mine, and I'm obviously lighter than you are and I went with a Comp LSR cam that's 219/235 .607/.621 113. I have a converter, upgraded the entire valvetrain, CNC LS3 heads, etc... and I still didn't get even close to that big.
If you can make it work or not is irrelevant, its just not even close to a good cam for you. Forget about that cam.
Ive got an LQ9 in mine, and I'm obviously lighter than you are and I went with a Comp LSR cam that's 219/235 .607/.621 113. I have a converter, upgraded the entire valvetrain, CNC LS3 heads, etc... and I still didn't get even close to that big.
Last edited by SweetS10V8; Apr 25, 2009 at 06:55 AM.
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Unless you are running a really short tire, that cam with a stock 4L80 trans, stock converter and 3.73's in a heavy truck is a bad idea.
Will you be able to live with it? Possibly/Probably
Will a good tuner go a long way toward making it better? Absolutley
But the bottom line is that is totally the wrong cam for your application on so many levels. You would be better off selling it and getting something that makes way more torque - lose about 15-20 degrees duration.
If you insist on running that cam, start shopping around for a 3000+ stall converter, look for some 4.30 or 4.56 gears, and be preparred to reach single digit fuel economy numbers.
Will you be able to live with it? Possibly/Probably
Will a good tuner go a long way toward making it better? Absolutley
But the bottom line is that is totally the wrong cam for your application on so many levels. You would be better off selling it and getting something that makes way more torque - lose about 15-20 degrees duration.
If you insist on running that cam, start shopping around for a 3000+ stall converter, look for some 4.30 or 4.56 gears, and be preparred to reach single digit fuel economy numbers.
In a truck bigger is NOT better. U have to have low/mid to get that mass moving. U will hate that cam w/ no verter. U need at least a 4200...then it's gonna wannna spin to 7k to make the power. NOT a good idea imo. Try someting in the 230's. Gotta have that mid range grunt. And for it to be good w/ gearing u would need at min a 4.10....but more like a 4.30 for it to really work.
But the bottom line is that is totally the wrong cam for your application on so many levels. You would be better off selling it and getting something that makes way more torque - lose about 15-20 degrees duration.
If you insist on running that cam, start shopping around for a 3000+ stall converter, look for some 4.30 or 4.56 gears, and be preparred to reach single digit fuel economy numbers.
Most guys like a 224° cam in a truck, personally I would rather have something smaller. I just CAN'T get myself to play with the 5.3L in my truck when that money is better off spent on Hoosiers for my race car.
Bret
Something in the mid to high 220 range is about as big as I have been looking to put in my TBSS. You will lose all bottom end torque like the trucks are designed for hence the single digit gas mileage and poor driveability. If it is for a track only truck, then I would say go for it. I would say to start looking into a blower if your interested in making big #'s with gas mileage. It is about the only way to go without massive weight reduction with a big cam as an everyday driver.
Since the heads allow more airflow, and the cam gives some extra time to fill the cylinders, is it unreasonable to conclude that we are reducing our pumping losses?
243/LS6 heads? I've read a lot about the efficiency of the combustion chamber compared to garden variety LS1 heads and truck heads. I've also read testimony (on this site) that AFR heads increase fuel economy.
Since the heads allow more airflow, and the cam gives some extra time to fill the cylinders, is it unreasonable to conclude that we are reducing our pumping losses?
Since the heads allow more airflow, and the cam gives some extra time to fill the cylinders, is it unreasonable to conclude that we are reducing our pumping losses?
Also in terms of the camshaft, the added overlap helps fill the cylinder with exhaust gases at low RPM, high vacuum cruise. This means less displacement to fill and less fuel is needed. That's a trick that comes from variable valve timing setups.
Bret
240/224 115 +3 ? 
I had a 244/242 612 112 in my 3500 lbs gto stock 6.0 and it was bareable but I wanted to change it after a while. It ran like a raped ape up top and hung with boosted cars in the similar catagory. The daily drive was okay but sometimes I wasnt too happy.
I wouldnt go with a large cam again unless I had the cubes to back it up...
With bolt ons I ran 1.8 60' 12.3 @ 113 360hp 361tq
with megadubm cam 2.2 60' 12.3 @ 113 446hp 403tq
with a heavy truck you need a nice tq curve... its all about tq.. to get you moving... IN my heavy goat I got took on low end but came back on top end and pulled like hell.... I would have rather had a tq cam and hooked/booked and sprayed up top
I wouldnt go with a large cam again unless I had the cubes to back it up...
With bolt ons I ran 1.8 60' 12.3 @ 113 360hp 361tq
with megadubm cam 2.2 60' 12.3 @ 113 446hp 403tq
with a heavy truck you need a nice tq curve... its all about tq.. to get you moving... IN my heavy goat I got took on low end but came back on top end and pulled like hell.... I would have rather had a tq cam and hooked/booked and sprayed up top