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Diesel Conversions Convert gas to diesel, or convert to a 6.2/6.5/Duramax/Cummins/Navistar/Isuzu/Perkins/Detroit/or ... diesel engine. Go here to see completed projects, works in progress, share your conversion or ask the experts.

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Old 02-16-2016, 08:13 PM
RickS2023 RickS2023 is offline
Join Date: Feb 2016
Location: Untied States -Alabama
Posts: 1
Default diesel. to gas

Can you put a 350 chevy gas motor where it was a 6.5 diesel the truck is 1994 1/2 ton 4 x4 how much of a problem is it or can it be done
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Old 02-17-2016, 01:24 AM
Yukon6.2 Yukon6.2 is offline
Join Date: Dec 2003
Location: Yukon Canada
Posts: 949

Yes it can be done
Bell housing is the same on both,motor mounts are the same.
The issue is your truck is computer controlled,if it's a standard then that becomes a non issue.If you have a auto then you need to figure a way to control it.To keep it simple you can use a carburated 350,but depending on your smog testing that's where it will get complicated.
If for off road use then it doesn't mater.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews
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Old 02-17-2016, 04:56 AM
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trbankii trbankii is offline
Join Date: Mar 2000
Location: South Central Pennsylvania, USA
Posts: 2,515

To expand, the 4L80E (if it’s an automatic) will need to talk to a computer. There are standalone setups to control the transmission - or you could go with a computer controlled 5.7L GM engine, which would entail switching all the electronics over for it.

For a manual transmission (the NV4500), there is no computer for the transmission. You could then go either with a carbed 350 or the electronic 5.7L depending on your desires.

But, as mentioned, if you have emissions testing where you’re at they’re going to need a fully compliant system for a ’94.
94 GMC 6.5TD K1500 4L80E 2-Door Yukon SLE 216K
93 Chevrolet 6.5TD K2500HD NV4500 Std. Cab Longbed 184K
85 Toyota 22R RN60 4x4 Std. Cab Shortbed 178K (Currently retired for rebuild)
Diesel Page Member #2423
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Old 02-17-2016, 08:16 AM
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DmaxMaverick DmaxMaverick is offline
Join Date: Apr 2001
Location: CA
Posts: 11,888

Welcome aboard!

As I recently reminded someone doing a different swap, keep it simple. It can be done, and it isn't uncommon, and it doesn't have to be complicated. Choose an engine platform compatible with the same year model, complete with all the accessories and drive/belt system, and swap it in along with the wiring harness and ECM featured the same as your truck. You'll also need coolant hoses and other plumbing accommodations, such as the gasser fuel pump, which can be either in-tank with the OEM fuel sender, or independent external (the Diesel fuel pump will not work). Transmission control, if an auto, is in the ECM, which makes that an important part of the swap. The Diesel computer is not compatible with a gas engine, in any form, unless the engine and transmission are either mechanical or independently controlled. Everything will fit, but it all has to speak the same language at both ends.

That said, consider the engine series generation to choose, if your emission rules allow. The 1996+ model years offers greater computer options, control and monitoring, as well as greater economy and power with the Vortec series. The series' also improve over the model years, with options for PFI vs. TBI fuel control. The auto transmission will also have to follow the technology series. 1999+ allows options for expanded engine series, including the 6.0L and 8.1L. Ideally, you will want to source a donor truck, and do the swap, side by side, whichever you choose.
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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