Hello all, I'm new here not just this forum but to the LS world as well. I have a 1991 c3500 dually that I want to put this lq9 out of an 06 escalade equipped with the DBW throttle body. I also managed to find a 4l80e transmission out of a 2003 chevy 2500 both engine and tranny have under 100,000k on them I plan to use the stock converter. I purchased the correct flexplate from summitracing with the built in spacer and came with the bolts as well. I am wanting to do a simple cam swap but don't know 🤔 which cam to buy or what would best suit my application a healthy lope wouldn't hurt either. I purchased Holley Terminator X Max Efi to run both the tranny and engine. Should I also be looking for a specific fuel pump? Thanks in advance.

 

A standard Walbro 255lph pump would be plenty with a good pressure regulator.

Stock converter means smaller camshaft. Like 212/218 size, I bet most places have that as a "stage 2" or something.

Don't forget about fuel injectors. I don't know what you have right now or what that 6.0 came with. Some factory injectors are 25lb/hr and others are 33's if the truck was flex fuel, the larger ones would handle a cammed 6.0 no problem.

 

Preciate it FFDP. The fuel pump you mention above is that an internal or external, if I upgraded the stall on the trans in your opinion is a worth it what kind or gain would I expect. I have a buddy running this cam ( comp cam link) https://www.compcams.com/cam-dynamic...en-iii-iv.html
makes great power but I'm not trying to reinvent the wheel so to speak just looking for a little giddy up. Thanks again bud

 

I doubt you would enjoy that cam in your truck

I run a 212/218 112 LSA in my 6.0 swapped 1500. I'd recommend it to anyone

 

What's the intended use and goals you have for the truck? This will help with cam recommendations.

 

Yeah that cam is huge for a heavy dually truck. You need something smaller that doesn't sacrifice bottom end torque for high RPM's.l

 

Summitracing The truck will be used for towing/pulling its mainly a workhorse. Thanks in advance

 

head over to 67-72trucks forum, been done a kajillion times a kajillion ways. Plenty of build threads to follow and get info from.
I've done 2 squarebody ls swaps, both different animals.

 

If you're going to be doing a lot of towing and pulling the stock converter and cam are generally the best.

A tiny torque cam would be okay, but won't make a ton of difference. I'd probably put that money into gears instead.

 

Pooter pretty much nailed it. For what you're going to be using this for the stock cam is probably best. Gears, headers, and a free-flowing exhaust could be of equal benefit or even more than a cam swap for what you'll be doing. If anything a stage 1 tow/torque cam could be of good use. Any of those style cams aren't going to have a lopey idle that you mentioned you wouldn't mind having.

If you wanted to look into cams something like our Pro LS Truck stage 1 tow cam would be a good one to look at. That is part number SUM-8718R1. Specs on it are .500/.500, 205/217, 112+2. The intake valve closing point is a good indicator of where you can expect the powerband to be. The stock cam for an LQ9 closes the intake valve 34* ABDC. The 8718 closes the intake 33* ABDC. In general the earlier you close the intake valve the lower the powerband will start. A nice thing about this cam is it can be used as a drop-in. That means no springs required. We do recommend budget-friendly LS6 , rings. We offer them in our own brand as part number SUM-174002.

Another tow/torque cam we'd recommend is the BTR torque cam. That is part number BTC-30202111R1. Specs on it are .511/.511, 202/202, 111+1. This closes the intake valve 31* ABDC. BTR does recommend LS6 style springs for this cam. You could use our springs above or BTR offers their own LS6 style springs as part number BTC-SP011-16.

You could even look at our Pro LS Truck stage 1 high lift cam. That is part number SUM-8719R1. Specs on it are .550/.550, 209/217, 112+1. The added lift over the two other cams will improve power and torque. Between the added lift and earlier intake opening, more low-end torque will be made. With the idle speed turned down you could get a bit of a lope out of it. The LS6 style springs would be a requirement with this cam.

As a reference, the stock cam specs for an LQ9 are .467/.479, 196/201, 116.