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SBC into 1992 4.3 G20
#754853 December 11th 2019 11:01 pm
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Hey guys, I've got a 1992 G20 with a tired ol 4.3 in it, and I believe a 700r4. Will a 350 bolt up to existing tranny and motor mounts? I have a good running 350/th400 in my '66 pickup that I'm pulling to do LS swap. Would I be better off using the th400? I'd really like to keep the overdrive for mileage. I also considered leaving my truck alone and putting the LS/4l60e in the van, but I haven't seen many LS swaps, and feel like the 350 would be pretty easy swap and have me back daily driving the van in a weekend. Thanks for any input!

Re: SBC into 1992 4.3 G20
harleydstone #754855 December 11th 2019 11:11 pm
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Pic of the two.

Attached Files 20191007_191226.jpg
Last edited by harleydstone; December 11th 2019 11:13 pm.
Re: SBC into 1992 4.3 G20
harleydstone #754856 December 11th 2019 11:38 pm
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old hand
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Quick and dirty is the 350/700r4 trans combo. You’ll need new motor mounts for the bigger 8 cylinder block but it will work fine with the 700r4. Your van already has the crossmember for it and will give you OD. LS swap would be cool, there are a few folks in here who’ve done it but is a lot of work and depends on what you want out of the van. Check the readers rides section and you’ll find some examples.

I’d leave the LS for the truck personally as that would be fantastic to drive with a modern drivetrain and worth more in the end.


1979 Dodge B200 Shorty, 1987 B250 Longy
Re: SBC into 1992 4.3 G20
Deathorvictory #754857 December 11th 2019 11:47 pm
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Thanks, that's the answer I was looking for. If I buy "stock" G20 V8 motor mounts, they will position the engine correctly for the 700r4's current position?

Re: SBC into 1992 4.3 G20
harleydstone #754861 December 12th 2019 12:16 pm
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Trans stays in the same place. It has a cross member and trans mount that’s all OEM and they did both motors with those transmissions. You can keep the trans, driveline, etc..

That being said, 92 is all fuel injection so it won’t be a direct drop in. You’ll have to keep all the functioning ignition, carb, vacuum lines, etc all that is making your 66 go down the road. Connections like oil pressure and engine temp may have be to figured out, not sure if all that is the same.


1979 Dodge B200 Shorty, 1987 B250 Longy
Re: SBC into 1992 4.3 G20
harleydstone #754863 December 12th 2019 12:49 pm
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Hey Harley you can fit a 454 with a 4L60E in there if you want to … a 350 no problems


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: SBC into 1992 4.3 G20
harleydstone #754942 December 16th 2019 12:42 am
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journeyman
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LS/4L60E is my vote!

Either way you go, the engine mounts are the same, but it's the mount towers that you'll need and these are tough to get. Expect some junkyard trips for find the V8 towers.

Last edited by JAGI410; December 16th 2019 12:43 am.

Jason
1984 Chevy G20 5.3L/4L60E
Re: SBC into 1992 4.3 G20
harleydstone #759025 April 11th 2020 10:09 pm
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I just did the same swap on my 1991 G10 - took out TBI 4.3 and put in a 700R4 with a 350 SBC and a Holley classic - you need different motor mount bases from a wrecked v8 van - and if you put long headers in you may need to modify the transmission cross member - getting rid of TBI crap is easy but you'll need a different fuel pump.
I LOVE my van now - so much simpler and the power is great - I can maintain speed on hills! A crazy concept after the 4.3.


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