6.2 Diesel swap to 350 gas - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-21-2004, 06:16 PM
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6.2 Diesel swap to 350 gas

I have never done a 6.2 diesel to gas SBC swap. Any body here done it? Whats involved? Motor mounts? Or is there anyengine (olds) or anything that would fit right in? It is a 4x4 1985 chev pickup. Will the current Auto tranny bolt up to a small block? Any wiring problems involved here to get an HEI distributor going? Please help.

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Old 04-21-2004, 08:24 PM
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There has GOT to be some mechanics out here who know something about this!
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Old 04-21-2004, 09:31 PM
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Well I can tell you that your tranny will be a chev bolt pattern so it will bolt up to either a small block or big block and the mounts I believe are the same as bb chev mounts which will also work for either. Running a wire for the hei will be simple enough.
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Old 04-22-2004, 12:17 AM
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the diesel and gas engines share tranny boltpatterns, its gm v8 pattern (sb and bb are the same) you may have to get different frame mounts for the motormounts, but your parts guy should be able to tell you if the part numbars for the sb and diesel are the same.

i think youll have to change the weights in the governor in the tranny, as the diesel shifts a couple of thousand rpm lower than the gas motor. other than that it should be prety straight forward. just run the wire that now goes to the diesel cut solenoid straight to the hei and it should work

remove the dieselfilter and such.

oh and remember to drain the diesel before topping off with gas
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Old 04-22-2004, 12:33 AM
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The fuel pump and the filter is the only difference, at least that's what I've herd.
And also that you can swap a gas for diesel and use the tranny as is. I don't know how it would work the other way around?
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Old 04-22-2004, 04:05 AM
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Thanks guys. I have used the diesel tranny in a gas before and never had a noticeable difference. I was thinking of the old 350 diesels before. I believe they were using the big block olds bolt pattern and motor mounts as I heard the Diesel 350 was based on an Olds block.

Any more ideas from anybody?
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Old 04-22-2004, 05:32 AM
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You also might need to take a look at your brake booster. If I remeber seeing a buddies 83 Chevy and there were lines coming from the powersteering pump to the brake booster.
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Old 04-22-2004, 07:32 AM
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there is no difference in boltpattern between chevy small block and big block!!! and there is nothing wrong with keeping the hydraboost brake booster, it os infact a better system than the vacuum booster.
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Old 04-22-2004, 07:34 AM
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Use 350 motor mounts. tranny will fit, go to the salvage yard and get a under hood wiring harness. if you have hydravac brakes, use the pump on the 350 and keep the hydravac. You will have to rework your exhaust system. Get a 350 flywheel, The fuel tank will work, but the vent system is different and a gasoline one will work better. It's really pretty simple. Good Luck

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