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Old 09-02-2006, 11:14 PM
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4.3v6 swap for chev 350sb?

i got an s10 blazer, with a 4.3 VORTEC right now. I got a late model th350 bolted to the motor. The 4.3 is a roller lifter/cam and its a 1 piece rear main seal. I know the vortec motors and the late model motors need different flywheels because they are different pattern. But my buddy has a 1989 Suburban with a small block 350 and its got the centerbolt valve covers, I dont know if it has a roller cam or if it has the new or late model rear main seals. but because i have the newer 4.3 motor with different flywheel and i already got the late model tranny bolted to it, will the SBC 350 just bolt directly to that tranny? i know the motormounts will be fine and it will bolt up that way but i was wondering if the 350 would bolt up to the existing 4.3 flywheel. I think both motors would share the same flywheel pattern because i know the bellhousing would bolt up. I just wanna make sure. Thanks!

1989 s10 blazer TBI 4.3
and
1989 Suburban TBI 350

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Old 09-03-2006, 08:56 AM
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in 1985 all smallblocks went 1 piece rear main. last half of1987 all motor went roller cam. flywheels should be the same,as far as your motor mounts there not gonna work you need to get 2.8 frame mounts and the motor mount kit for sb to 2.8. there adjustable and makes it alot easier, jeggs has them i got mine from a website called jtr jaguars that run. these are better there laser cut and adjust more to the passenger side for exhaust clearance. they got every conversion kit you can think of.
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Old 09-03-2006, 11:35 AM
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i actually have a 4.3L not the 2.8L.. i was pretty sure that the 4.3 and the 305 and 350's all shared the same motor mounts.???
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Old 09-03-2006, 12:26 PM
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they do share the same mounts on the block but the frame you need 2.8 to work with the offset adjustable motor block mounts that im talking about they bolt in place where 4.3 mounts were. for example when you have a 2.5 they recomend you switch to 2.8 mounts for the kit to work.
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