engine swap question
 

hey guys,
im new to the forum and was wondering, i have a 67 chevy with a carburated 350 with mods and saw a 1990 gmc sierra reg cab short bed for not to much at the dealership i work at. it already has a fuel injected 350 in it and i was wondering how hard it would be to swap the motors out...
Thanks in advance
this is in the 67, all the same not,exept the carb.

http://i1297.photobucket.com/albums/...ps3c951a92.jpg
http://i1297.photobucket.com/albums/...psf616ec0e.jpg
This in the sierra
http://i1297.photobucket.com/albums/...psc4e268b9.jpg
http://i1297.photobucket.com/albums/...psa08ec45b.jpg

Engine swap will probably be straight forward. It's the electrical that will be a bigger chore.
Electronic fuel pump in the fuel tank. So you'll be switching out fuel tanks too.

what tank could i use, if i swap the tanks that would really be the only thing though, right?
im trying to figure out what else there is but i cant think of anything...i think it has a 700r4??? i have the same trans on the other as well

Well the thing about the transmission in the '90 truck is it has an electronic torque converter lockup, and an electronic speedometer. I really don't know anything about making the TC lockup independent of the ECU, but I'm sure it could be done relatively easy.

I'm assuming it'll be pretty easy. Almost exactly the same engine. Honestly though, I would say to keep the TBI intake and bore/tune it instead of going carburated. Now you want to go TBI/electronic 350 in the '67, or carbed engine in the '90 truck?

It won't be a power house but will make the '67 more driveable.
Should be a fairly easy swap and painless wiring might even offer a complete EFI harness for your needs. Fuel pump will be easy as well, TBI motors only need 9-13 PSI of fuel pressure so a frame mounted electric pump will work. There are internally regulated pumps but I'd prefer to use one that has enough flow/pressure for a return system utilizing the TBIs pressure regulator. IIRC there is a speedo drive unit that will give you a electronic signal for the ECM while allowing a cable to operate the factory speedo. That will require changing out a speedo drive gear on the output of the transmission.

OK, just looked at the pics.
What exactly are you thinking about doing?
That carb'ed motor has roller rockers, aluminum heads, high rise dual plane intake, long tube headers etc. Depending on cam, compression etc it might not run right with a TBI unit at all.

488/302 cam , 11:1 compression

I put a injected engine in my 82. But I did a total makeover on my truck, interior for replaced and everything, s I pretty much took the wiring harness off on the 2001 and put it all in the 82, and I used the 01 tranny, instriment panel, and all that.

Uh, yeah, no on the TBI for that motor.

So are you gonna put the carb'd motor in the '90?

I would like to, from what i understand all i would really need is a fuel pressure regulator and not much else....pull out engine and trans in the 90 and put the 67s back in.... The trans is a 700r4 so it should hook right up to the drive shaft.... Never done it so im hesitant...but doesnt sound to bad

Why do you want t put the carb engine into the 1990 truck?

Seems like his built carb motor makes considerably more power than the stock TBI engine that's in the '90 truck. If I were in that situation, I'd probably do the same thing.

Seems too like to much of a pain to me. I'd rather drive around the 67 :D

not really alot of trouble a couple of hours,.... i was showing the 90 truck to someone the other day and i noticed it had all new wiring a new brake booster and a/c compressor...with american racing aluminum wheels and when i ask whaT the employee pricing was, they said 1250.....it made me wonder.... you drive that 67 in a texas july/august with no a/c and see what you think

I have drove my truck in Texas. I take the A/C off all my trucks. I gain about 2 MPG doing so. Plus, does the 67 Engine have a place for a A/C pump? The 67 wold have had the old V belts, where the 90 would have the more modern style belt. Good luck swapping out all the pulleys, or trying to find a V belt pulley or pump if there is even a place to mount it.

Vintage Air can fix that for you.

All the accessories from the '90 will bolt onto your engine in the '67. You will need to swap the water pumps as well since the serpentine uses a reverse rotation water pump. Very easy to do. Another thing is he doesn't have original '67 heads, which wouldn't have accessory holes in them.

The fuel pump will need an external regulator but it may not be able to keep up with the volume needs of the hotter engine.

Will need a ignition feed for what I'm assuming would be an HEI distributor on the carb'ed motor.
Throttle cable may/may not work.
Will need a digital signal converter to get the speedo to work on the '90.