My 2001 240,000mile, 5.3/4L60/4x4 Tahoe Tow/winter rig is Tired. Last weekend I I pulled my 5500lb boat over the pass at a neck breaking 40mph. This rig gets driven maybe 4000 miles a year, So I’d rather not dump to ton of money into it. I’m not looking at 1/4m, or high rear wheel horsepower. Instead I’m looking for a reliable fun to driver tow rig that gets decent non-towing mpgs with a power band below 3600 rpms. Earlier this year I picked up a LQ4/4L80/TC all mated with 98K out of a rolled 04 2500HD. So I’ve been doing my research and came up with five options ranging for leaves everything stock to stocker to radix w/a cam.

Here’s what I’m thinking: LQ4, with 206/212 cam, 7.4 hardened pushrods, PAC 1218 Springs, Timing Chain, Pacesetter LT headers, Tune, ….

But the things I’m question there worth for this build is TBSS intake w/ 87mm TB, will I benefit from this mod or not just leave the stock intake inplace. Besides then I wont’ need to do a DBW to DBC swap. And then Bigger Injectors? Do I need then, IIRC the TBSS intake has 30# injector.
Anyways what do you think?

 

For your purposes, leave everything stock, down to the exhaust. It will pull great. The headers will do nothing for you below 3000 rpms.

 

x2 get a tune for the 6.0 and some deep gears and it will tow great .

 

What about improving overall performance and mpgs. I read that the 6.0 in stock form are under-cammed, is this not correct?

 

lq4-206/212-factory exhaust
keep your autotrac T case with the new input.
also look into some 4.10 or 4.56 gears depending on tire size.

 

im doing kind of the same build right now, i have a crew cab with a 4.8 and i just picked up a stock 89k mile lq4

my build will be as follows,
take heads off and mill .030
ls6 springs

see how it does on mileage and towing, if i need more power ill throw a small cam in it, 212 or something, but im betting just milling the heads will provide all the power i need...

 

Sounds like an application where Thorley's would be a good header choice.

 

i just ordered a cam for mine....212/218 .533/.533....:/ lol

 

Read this thread, just food for thought. https://www.performancetrucks.net/fo...ds-lq4-488441/