2.8l to 3.1l - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wyattglock · 12-17-2016, 10:03 AM

I have a 1993 S10 extended cab with a 2.8l 5speed. It is a 2wd. The oil pump decided it was done at 225000 miles, so now it needs rebuilt. I found a 1991 camaro 3.1l automatic with the wiring and computer for a great price. It has 91k miles on it. My question us this, can I swap the engines out and keep my 5 speed trans and current truck setup with the 3.1l? I figure there will be differences in the intake, but I should be able to swap my intake on it and keep the tbi.
Thanks in advance. If thereally wasn't ice covering everything here in Indiana, I would get some pics of the truck.

GASoline71 · 12-20-2016, 02:19 PM

Is the 3.1 a 60 degree engine like the 2.8?

Gary

wyattglock · 12-21-2016, 08:06 AM

Yes it is. Currently, it has a 700r4 attached to it. I have the complete engine, harness, and computer from the camaro. I am going through wiring diagrams to see if I can adapt the harness to my truck fuse panel and just use it as is.

GASoline71 · 12-21-2016, 04:29 PM

I would think it would drop right in.

Gary

wyattglock · 12-21-2016, 06:12 PM

Thanks! Now that the engine is in front of me, I am sure it will match up to the bellhousing ok. I am going through the wiring harnesses right now. I may try and keep the mpfi on the 3.1l since it literally has everything new on it. The shop that went through it 3k miles ago showed me all the receipts, a video of the engine running before taking it out, and the car it came from. If I can pull off the swap using all the camaro stuff, that would be pretty cool.

Tom · 12-21-2016, 08:15 PM

People do this swap all the time. Put a Firebird 3.4L into a 2.8L Fiero once.

wyattglock · 12-21-2016, 08:31 PM

Cool. I am finding a lot of info on the 3.4l, but not much on the 3.1l. I know the heads on the 3.4l flow much better. Other than that, I couldn't tell you the differences.

sweetk30 · 12-24-2016, 02:14 PM

gm use to offer a crate engine just like what you want to do . even came with the ecm prom to make the computer feed the fuel mix correct for bigger engine.

wyattglock · 12-24-2016, 02:53 PM

No kidding?! That's cool! I am going to dive into this starting tomorrow. Need the truck back on the road. It may take a couple days to splice in the wiring, but I am pretty optimistic about my odds. Thanks for the help guys!

wyattglock · 12-24-2016, 02:56 PM

Here is my truck.

12-17-2016, 10:03 AM	#1
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	2.8l to 3.1l I have a 1993 S10 extended cab with a 2.8l 5speed. It is a 2wd. The oil pump decided it was done at 225000 miles, so now it needs rebuilt. I found a 1991 camaro 3.1l automatic with the wiring and computer for a great price. It has 91k miles on it. My question us this, can I swap the engines out and keep my 5 speed trans and current truck setup with the 3.1l? I figure there will be differences in the intake, but I should be able to swap my intake on it and keep the tbi. Thanks in advance. If thereally wasn't ice covering everything here in Indiana, I would get some pics of the truck.

12-21-2016, 08:06 AM	#3
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	Re: 2.8l to 3.1l Yes it is. Currently, it has a 700r4 attached to it. I have the complete engine, harness, and computer from the camaro. I am going through wiring diagrams to see if I can adapt the harness to my truck fuse panel and just use it as is.

12-21-2016, 06:12 PM	#5
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	Re: 2.8l to 3.1l Thanks! Now that the engine is in front of me, I am sure it will match up to the bellhousing ok. I am going through the wiring harnesses right now. I may try and keep the mpfi on the 3.1l since it literally has everything new on it. The shop that went through it 3k miles ago showed me all the receipts, a video of the engine running before taking it out, and the car it came from. If I can pull off the swap using all the camaro stuff, that would be pretty cool.

12-21-2016, 08:15 PM	#6
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	Re: 2.8l to 3.1l People do this swap all the time. Put a Firebird 3.4L into a 2.8L Fiero once. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

12-21-2016, 08:31 PM	#7
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	Re: 2.8l to 3.1l Cool. I am finding a lot of info on the 3.4l, but not much on the 3.1l. I know the heads on the 3.4l flow much better. Other than that, I couldn't tell you the differences.

12-24-2016, 02:14 PM	#8
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: 2.8l to 3.1l gm use to offer a crate engine just like what you want to do . even came with the ecm prom to make the computer feed the fuel mix correct for bigger engine. __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

12-24-2016, 02:53 PM	#9
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	Re: 2.8l to 3.1l No kidding?! That's cool! I am going to dive into this starting tomorrow. Need the truck back on the road. It may take a couple days to splice in the wiring, but I am pretty optimistic about my odds. Thanks for the help guys!

12-24-2016, 02:56 PM	#10
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	Re: 2.8l to 3.1l Here is my truck. Attached Images



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