Question about 1991 GMC K1500

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1996 GMC K1500 engine replacement

Can I replace my 305 motor with a 350? I've been told there is no problem, everything should bolt up correctly and work fine. Is this true?

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The other thing to keep in Mind is The Vortec is a computer managed engine you will need to install a computer for a 350 but they do bolt up exactely the same, The other thing to look at before hand is weather or not the block you plan to drop in has all the same accesorie attachment point, 305-350 shouldnt be a problem but 350 down grade to 305 you will find the heads do not have the same bold pattern on the ft end for axcessorie mounts!

Posted on Oct 16, 2008

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Everything will bolt up the same the only difference between the two is the bore the 350 is the better engine of the two

Posted on Oct 13, 2008

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3 Answers

Can a Chevy 305 engine bolt in place of a 1985 Oldsmobile cutlass supreme 307 engine?


Yes and no.
Yes it could bolt in place, but it could take a lot of work changing every thing over.
Exhaust, transmission, wiring, cooling, and so on.
Probably nothing except the crossmember would be the same for both engines.

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May 27, 2012 | 1996 GMC Sierra

1 Answer

What year motors, can I use to replace my blown 1996 305 vortec? I own a 1996 GMC 1500, sl, ext. cab. Does it have to be a vortec for my current computer to work properly? Will engine mounts, bell housing,...


You can use any 305 motor. Like you said you will have to exchange parts from your old motor to the new one. Just make sure you don't go to far back, because the old 305's don't have the injector ports. Then you would have to replace the heads also.

Jan 23, 2011 | GMC Sierra 1500 Cars & Trucks

1 Answer

What year motors, can I use to replace my blown 1996 305 vortec t.b.i.? I own a 1996 GMC 1500, sl, ext. cab. Does it have to be a vortec for my current computer to work properly? Will engine mounts, bell...


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Jan 22, 2011 | GMC Sierra 1500 Cars & Trucks

1 Answer

What year motors, can I use to replace my blown 1996 305 vortec t.b.i.? I own a 1996 GMC 1500, sl, ext. cab. Does it have to be a vortec for my current computer to work properly? Will engine mounts, bell...


Untill recently GM didn't change much of anything as far as bolt paterns You could bolt up a 350 from 20 years ago to your transmission and motor mounts. But that is not really what your wanting to do. The question is do you have a "vortec" or is it TBI. The vortec motor says vortec all over it (they were pretty proud of it I guess) The earlier TBI motor, at first glace look just like the old carburetor versions until you take of the air cleaner and find a throttle body instead of a carburetor. The two are not interchangeable as to the electronics, they are way diffract.

Jan 22, 2011 | 1996 GMC Sierra

1 Answer

What size wrench do I need for the bolts to replace the starter motor on 1988 gmc 1500 with a 305 engine


Hi,
9/16 socket with an extension an a ratchet.
They will be pretty tight so a 1/2 inch drive will help break them loose.
Good Luck
Wayne

Oct 12, 2010 | 1992 GMC Sierra K1500

1 Answer

Replacing starter on 1992 gmc sierra 305 v8 motor


disconnect the battery lead from the starter plus other wires,undo the bolts on the starter flange & the starter should pull straight out providing there is nothing else in the way if there is anything it will have to be removed first.......hope this helps......cheers

Jul 29, 2010 | 1992 GMC Sierra K1500

1 Answer

What is the best engine to replace my 91 350 TBI engine in my 91 gmc single cab stepside. I want more power but dont want to break the bank


454w/smaller carbs, you will go through everything. you could choose 396 old school for gas mileage, great engine.

May 18, 2010 | 1991 GMC K1500

2 Answers

How do i find out if my 94 k1500 has a 350 or 305


iambanshee74 is right if your engine has never been swaped out,because a 350 will fit anywhere a 305 fits,the best way i found is to look at the exhaust manifolds if they drop down off the port at all ports good chance its a 350 but if they go straight acrose and only drop down in the back to the pipe,it will be a 305.

Jan 20, 2010 | 1994 Chevrolet K1500

1 Answer

Replaced 305 engine with 350, runs poorly at steady speeds


try replaceing/testing knock sensor, unless you already did

Dec 01, 2008 | 1996 GMC Sierra

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