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Old August 14th, 2013, 08:05 AM   #1
Red97
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Default ls 5.3/6.0 vs 8.1/allison

Just wanted some outside opinions on which direction to go with my sas 97 k1500. I am getting tired of the 305. quick specs of the truck, d60 front open,4.56 gears and 35 spline outers. 10.25 rear limited slip,disc brakes. built 4l60e/241 sye, with 1410 drive shafts all the way around. just a driver/dune truck.

what would you do?

5.3,cam,intake,headers,tune. Same with a 6.0

or a 8.1 with cam/headers/tune. With Allison/241 or 271?

want to know your thoughts.
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Old August 14th, 2013, 08:40 AM   #2
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If its just for being a driver, then an iron 6.0 (LQ4 or LQ9) with a cam and tune would be my choice. Good power for the $$$, and should be an easy swap. If you've already got the 4L60e built up OK, I think it should work with the Gen III/IV. 97 should be PWM clutch control, and compatible electronics.

These are pretty easy to get to 425-450hp with the cam/headers/tune.
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Old August 14th, 2013, 01:26 PM   #3
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i'll vote for the 5.3/6.0

easy to find
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Old August 14th, 2013, 01:49 PM   #4
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8.1 is an expensive motor to find/replace
I heard that all the internal parts are unique to the engine
6.0 all the way
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Old August 14th, 2013, 02:18 PM   #5
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Ok, I have access to a 8.1 runs great but at 270k and the trans works but has issues. I would have to find a 5.3/6.0 but my trans and t case would work. I just cant get over the thought of a camed 496. Lol
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Old August 15th, 2013, 12:21 PM   #6
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Quote:
Originally Posted by Wramblerguy View Post
8.1 is an expensive motor to find/replace
I heard that all the internal parts are unique to the engine
6.0 all the way
Yeah, 8.1s are limited parts, and not common with early big blocks.
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Old August 15th, 2013, 08:20 PM   #7
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I thought the 8.1 was just a tall deck 454 with longer stroke and different heads? I was under the assumption all the internals were the same as vortec 454? I may be wrong though. How hard is it to get a 6.0 to get decent torque below 4000 rpm?
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Old August 18th, 2013, 07:43 PM   #8
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my vote is for the 6.0, but I'm biased

love my lq4 out in the dunes or on the trails. makes nice power down low and rips all the way to 6k. it's cammed/tuned/headers

soon to get some head work done too

well built th350 behind mine

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Old August 18th, 2013, 08:43 PM   #9
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Quote:
Originally Posted by Red97 View Post
I thought the 8.1 was just a tall deck 454 with longer stroke and different heads? I was under the assumption all the internals were the same as vortec 454? I may be wrong though. How hard is it to get a 6.0 to get decent torque below 4000 rpm?
No.. difference firing order, different cam, different head bolt pattern, different intake ports, all metric fasteners, different oil pan, very limited aftermarket. Supposedly some of the aftermarket parts are for oil rigs that run these engines up to and over 600 cu in.

Probably 150-250 lbs lighter than an LS, depending on which block is chosen.

Proper camshaft and torque converter selection are going to be key to getting good powerband.
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