Looking to put ls1 in 81 square body

[brik]

Hey guys new here and I was wondering how easy it would be to drop an ls1 into an 81 gmc 1/2 ton? Ive come across a good deal on the complete engine, wiring harness, and ecu.

The truck currently has a 98 vortec 350 in it with a th400. Will the ls1 bolt up to the 400 no problem? I know I need the motor mounts. Anything to add or recommend or comment on would be greatly appreciated. Thanks!

[RedHeartbeat]

LS1 out of what?

[brik]

Camaro. Not sure what year tho, hoping to find out tommorrow.

[RedHeartbeat]

1999+ I would hope, I'm not a big fan of the one year only 1998 engine setups.

[ducky]

check out 1BADC10, he put a 5.3 in his 85

[brik]

Is it hard to get the computer and everything to work together? Does the computer need to be reprogrammed? Id be bolting it to a th400 which is hydraulic obviously so the computer wouldnt be running it (being electronic) which would throw a light correct?

[RedHeartbeat]

Just need to get a custom tuned PCM. Contact NelsonPerformance for one great tune, its worth every penny. i have my own software but always have them do my tuning.

[razors10]

here is a link to my build it could help you

http://www.ls1truck.com/forums/my-ga...ut-2010-a.html

[1BADC10]

I'm sure there's a conversion kit for bolting to an older style transmission. I've thought about converting back SBC style, but money's tight right now. The LS engine is great (don't get me wrong), but SBC is so much simpler. For about the amount I spent on the swap, I could've had a MONSTER of a stroker in my truck.

Good luck on the swap. Search around the forum (this section particularly), and you'll find just about everything you want to know.

[DBRODS]

The transmission's bolt patterns are the same, they will bolt up just fine.