LS swap advice

Steve A said:

Do your research is the main thing, read everything you can find. The better informed you are the better. Plenty of experience on this forum and the internet in general. Like others have said gather as much of the needed parts as you can before hand. Any and all parts you can acquire without digging into your budget money effectively increases the budget. Also, think about starting a build thread. Everyone likes to see what others are doing, anyone can have a good/great idea that others might be able to use.

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L31MaxExpress said:

Find a 6.0L/4L80E 2500 or 3500 Van for a donor. Cheaper to buy and better driveline than a 5.3/4L60E. Just watch out for ones with the base 4.8.

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Kevmore007 said:

How is this project coming along? I'm in the process of doing a 6.0 swap into my 2 door Yukon. The 5.7 is so weak, I bet there is only 190 rwhp.

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Drunkcanuk said:

The OP was last here in 2020, doubt you will get a response.
And you would be lucky to see 190 at the flywheel let alone the real wheel!!!

All jokes aside, hopefully you have a build thread going on.

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L31MaxExpress said:

It really depends on where you want your power. A heavy truck, suv or van, I want the Gen 1 small blocks torque or a big blocks torque. 99.5% of the time the engine will be under ~4,000 rpm with either engine.

This was a stock internal 8.75:1 350 TBI. Edelbrock 3704 manifold bored to 2", 2" oval open center spacer, 2" marine TBI unit, headers, dual 2.5" exhaust and tuning. Stock camshaft and stock 810 swirl ports. Vortec 5.7L with headers and tuning makes 30-40 hp more. The HD L05 started out at 180 hp and 300 tq at the crankshaft.

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This is a LQ4 6.0L before and after tuning. Pulling the same load, the 350 will climb most grades in 3rd and the 6.0L will be in 2nd gear.

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BeXtreme said:

That seems oddly low. I wonder what makes it like that for the early 6.0's. I'd be interested to see one of the iron Gen IV 6.0 blocks with the 823 rec port heads on them(LY6). Motortrend has a dyno graph of one on an engine stand, and it made more than 400 ft-lbs between 3k-5600RPM, which is pretty darn good(and that was with the stock cam and engine).
https://www.motortrend.com/how-to/converting-truck-ly6-engine-ls3-power/

The aluminum 6.2L with 823's and a mild cam make more than 300lb-ft from 2k RPM all the way through 6500rpm and peak at over 400ft-lbs with over 450hp to the wheels at 6500rpm. That's on an LS3 setup too, with a mild VVT truck cam it is shifted even lower in the RPM range.
https://www.ls1gto.com/threads/l92-dyno-resluts.198868/

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