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LS swap
#741629 October 16th 2018 4:07 am
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DCol63 Offline OP
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Hi everyone,

I have a 1974 GMC 1500 and I'm looking to put a Gen IV, 6.0 L with a 4L80. Has anyone come across any particular problems with the install such as clearance to the frame or the doghouse? One concern I have is that the a/c compressor may be a problem. Any advice or suggestions would be greatly appreciated.
Thank you in advance.

Re: LS swap
DCol63 #741637 October 16th 2018 11:07 am
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DCol83, Hello and welcome to the Site!

Pretty ambitious swap, and gotta love Goin Big!

Safe to say the front cross member comes out. Seen a few swap threads on here with pics. LS? IDK. DynoDave just posted up some info on the Chevy/GMC post 1995 GMT Vans. The newest models do have the 6.0 motor. Size never mattered in the Smallblock swaps I've done, but measuring a factory Big Block G30 will tell you what they crammed in under that Doghouse.

Why couldn't an AC compressor be remotely located, and driven by an electric motor?

Re: LS swap
DCol63 #741638 October 16th 2018 11:20 am
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Welcome to the site DCol ....


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: LS swap
DCol63 #741644 October 16th 2018 3:00 pm
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DCol63 Offline OP
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Thank you,
Is a 5.3 going to be much different?I thought they were the same size. I figure that I may have to maybe notch the cross member and maybe change to a lower profile oil pan.i know there are motor mount kits out there and may have to modify those. I definitely want a/c as I plan to make it a daily driver.

Re: LS swap
DCol63 #741646 October 16th 2018 4:29 pm
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carpal tunnel
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carpal tunnel
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Re: LS swap
DCol63 #741657 October 16th 2018 6:07 pm
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Looks like a good start. I'll give them a call tomorrow.
Thank you

Re: LS swap
DCol63 #741663 October 16th 2018 10:02 pm
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Originally Posted by DCol63
Thank you,
Is a 5.3 going to be much different?I thought they were the same size. I figure that I may have to maybe notch the cross member and maybe change to a lower profile oil pan.i know there are motor mount kits out there and may have to modify those. I definitely want a/c as I plan to make it a daily driver.


https://www.onallcylinders.com/2017...ory-overview-gen-iiiiv-ls-engine-family/

Here's some more LS info to go along with the cool stuff from Catfish.

Good point about the smallblock size comparison. I was wondering more about the height and location of the induction plenum, throttle body, exhaust and driven accessories. You might be able to see how the newer vans mount those on the LS block to fit under the Express cowling and doghouse and may be able to use that method in your build.

My smallbocks were in a '70 C10, and a '65 Impala. You'll be going way deeper that that. Go Team LS swap!

Re: LS swap
DCol63 #741677 October 17th 2018 8:20 am
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I wonder if you sourced your engine setup from a newer Express van if the belt drive would be re-arranged to better fit with the A/C? I've never seen one in person to compare so I'm just speculating.


[Linked Image]
Re: LS swap
tuner4life #741703 October 17th 2018 8:03 pm
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https://www.youtube.com/watch?v=arAnA65RMNo

Some more info for your LS swap D,

No more Gasoline powered Vehicles by 2050? I find I kinda don't think so.

Here's an LSIII going into an early Nova Wagon. Worth watching. Nice shorty headers that look promising. Then, at 6:20, She goes into detail concerning the motor plate/engine motor mount components. Mentions difficulties with the AC drive, and names some suppliers in the video. Funny flexplate lessons. Flip Flops made me cringe, but one loaded ratchet to a toe will cure that.

Hope this helps. Good American Family Fun Video. Cute Dog, Good Skills, Nice Car!

Quality Chevrolet never could get the correct lower mount for one side. I ended up chaining down the high side of the motor in the Impala. '73, '74? Always a good idea anyway. Especially a 283 backed up by a PG... grin Traded that $250 '65 Impala to my BILaw for a '59.
The drivetrain then went into his Econorail. shift
Carlsbad Raceway is buried under a Business Park now. But the Heartbeat of America lives on.


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