Camshaft duration question

I have a 2005 2500 HD 6.0 with a bit of work done to it but i wanna put a cam in it, I know I can put a 591 lift in and I want 112* or 110* sep but Im not sure what duration to use so I dont have clearance problems with stock heads. I was also wondering if anyone else had put the 591 lift cam in theres, I wanna know how the low end torque changed, if it went to low i cant use it, I still need to be able to tow some stuff, I have 4.10 gears and a very short 1st gear (17mph) so I dont know if it would be bad, if you have any information id appreciate it.
thanks

A cam with that high of lift is gonna end up needing a big stall I would think. So towing and a large stall usually dont mix very well.

What is the weight or body style of your truck? Heavy trucks don't like high stalls. I don't think I'll ever be able to tow anything again, just too much "slippage"

its not an auto its a 5spd manual and its an extended cab regular bed

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Originally Posted by itconsumes

its not an auto its a 5spd manual and its an extended cab regular bed

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sorry i can't really contribute, but i just wanted to give you props for being another manual guy!! automatics are just too boring to drive

and with that NV4500, that 5.02 first gear is low

That's a lot of cam that will need a lot of supporting mods.

with a standard transmission, you dont have to worry about as many tuning issues, or the stall issues like us auto guys do. However, if you plan on towing, I would not get a cam thats too crazy. Yes first gear is low, but if you engine has nothing until 3k rpms, you will learn real fast that you have to slip the clutch to not kill the engine. There is a cam called the cheaTR cam. Specs are like 214/230 .601/.578 on a 117LSA. Stock idle, good power from idle to 6500rpms. That would be a nice cam good for probably 25-45whp. plus a better power curve/torque curve.

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Originally Posted by zebra

automatics are just too boring to drive

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Not when you have a B&M ratchet shifter :naughty:


I've been looking into cams for my 6.0 also, and am finding that anything less than a 114 LSA is going to be hard to find except if you get a custom grind. I am, however, only looking at cams in the 210-220 dur and .550 lift range. Because I, too, am all about torque and "useable" power. I drive my buddies nuts. I just don't see the point of having all that power up at 7000 rpm.

Here's a great link to a Hot Rod article where they dyno a LS6 with a stock 117.5* LSA and a couple cams in the 110-112 range. Amazing how the power curves shift downward.

General Motors LS2 Small-Block - Cam Swap - Tune - Hot Rod Magazine

Anyway I think it has to do with c/r, lift, and LSA. I'm shooting for a 10.24 compression and a .550 lift with as low of duration as I can get. :twocents:

Like I said before, Keep the LSA around 114. That way you don't have to rev the poop out of it to make power.