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View Full Version : 4.3/350 ??


FU Toolbag
06-23-2009, 06:23 PM
Can a flywheel from a 350 work on a 4.3?

nbrowser
06-23-2009, 06:30 PM
It should, the 4.3 is basically a small block V8 with two cylinders lopped off....

FU Toolbag
06-23-2009, 06:37 PM
I'm worried about ballance problems.

nbrowser
06-23-2009, 06:49 PM
Stick or auto ?

InteriorZR2
06-23-2009, 06:55 PM
As far as I know as long as it is the correct series of engines it should work. Vortec engine requires vortec flywheel. [cheers]

FU Toolbag
06-23-2009, 07:09 PM
Stick or auto ?

I'm not sayin nuttin here.:happy0045:

FU Toolbag
06-23-2009, 07:11 PM
As far as I know as long as it is the correct series of engines it should work. Vortec engine requires vortec flywheel. [cheers]

The 350 is outa a late 70 truck and the 4.3 came outa a late 80's astrovan. I beleive its one of the only years you could get a carb'd 4.3...

nbrowser
06-23-2009, 07:16 PM
Yah, Vortec V6's didn't start showing up until about '93 or '94....

Hotsauce
06-23-2009, 08:49 PM
From my days working for GM i think i remember the late 86thru89 4.3ltr fly wheels are the same as the 5.7ltr with the 700r tranny. Now i'm not sure if late 80's fly wheels matched up to early 70's 5.7s? They can't be that far off either way.

FU Toolbag
06-23-2009, 09:38 PM
Just to make sure here, I'm putting in a stick, not an auto. I already have an auto mocked up to it right now but would rather put in a stick. I'ld rather put the 350 in, but I'm about 2 inches short of that.

boyzen
06-23-2009, 09:54 PM
move the rad in front of the rad support

FU Toolbag
06-23-2009, 10:31 PM
move the rad in front of the rad support

Was going to do that, but the wife wants the 350 now. Might change by the weekend, but who knows.

lester
06-24-2009, 01:58 AM
i think that the 86 and up motors had a 1 pice rear main seal and there for a difrent bolt partern on the fly wheel or flex plate