Hello Guru's

I have a 1999 yukon vortec 5.7 auto with engine problems,i found an ls6 motor with 30k on it ,will this motor bolt up too my tranny, wiring?

this is part of the ad......LS6 engine, complete, from a 2001 z06 with 30k kms
$1800


thanks
Andrew

buy it.

It will fit. The wiring should be REAL close. The PCM will need to be flashed to work right. I would expect accessories to be the biggest difference. You will more than likely need to swap them over.

The truck engine and the car engine are the same basic architecture. Many builders will use the iron LQ9 block to replace the aluminum LSx block when doing major boost.

Damn... that would be COOL.

I'm going to offer the guy $1500

Its a bolt in per sey. Check the engine for the oiling issues they had as there was a low tension ring issue I believe that was fixed via TSB etc for the 2001 LS6.

the motor in the yukon is fouling the plugs on the centre plugs right bank really bad and i dont know if its rings or valve seals/guides,so im thinking just drop in the ls6 ,would be a fun job,will it bolt up to the bellhousing?

Yes. GM Bellhousings have been pretty standard for years.

thats good 380 hp

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385.

i am 99% sure that the 99 yukons had the first gen sbc's in them. its not a direct replacement.

I am not so sure... lemme check.

I did some research... considering it is an iron head and block, I bet you are right.

I thought the LSx family of Vortec engines started in 1999... a couple of years past the LS1 started in the Vette.

so it wont bolt up,i left the guy with the motor 2 messages no return call ,maybe its sold??? well i'll just pull the heads off the 5.7 and see whats wrong with it...hope its just a valve spring.

Quote:

Yea, '99. My 2000 Silverado has a 5.3 Vortec.

then what is in this yukon?

5.7 L31
Engine Details
SAE Net Horsepower @ RPM 255 @ 4600
Engine Type Gas V8
Engine Order Code L31
Displacement 5.7L/350
Fuel System SFI
SAE Net Torque @ RPM 330 @ 2800
Engine Oil Cooler Yes

L31 should be a gen 1. the only 350 im aware of is a gen 1/2 sbc

gen 3 had the ls1/ls6 with 346cuin

if it were a gen 3 it would be a 5.3 or a 6.0. i worked on a tahoe a few weeks ago that was a 99 and had the older style 350 in it.. i know they changed the trucks in that year to the new style..

He has the early 99. Late 99's got the 5.3 like mine which is LS based.

Looks like we should do an LT1 swap, then

It will still bolt up to your trans. YOu will need a different converter and motor plates for the mounts. You can get a harness at Current performance that will allow you to run the car and motor but will need a computer from the LS family for the engine. It won't be a direct swap and there is some homework you'll need to do but anything is possible if you have the time and money.