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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
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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
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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.
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Old 02-17-2016, 04:56 AM
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trbankii trbankii is offline
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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.
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Old 02-17-2016, 08:16 AM
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DmaxMaverick DmaxMaverick is offline
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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.
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