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'01 4.3 into an '85 replacing 2.8: questions

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Old 08-11-2012, 12:10 AM   #1
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'01 4.3 into an '85 replacing 2.8: questions

I am looking at a very very clean, i believe a 2001 4.3 vortec engine for 500 bucks.

I've got a standard bellhousing 700r4 that I will need to rebuild and get a new converter for.

As far as the engine, I'm not sure what all I am going to need for it and any help would GREATLY be appreciated as I am on a short time limit, BUT, I will in the mean time search for more answers.

I will need an Edelbrock carb manifold, but which one?

I will need a flywheel, I think?

Will I need new exhaust from the manifold down the the cat?

Will my hei distributor work?

Any frame work for the motor mounts?
Old 08-11-2012, 09:07 AM   #2
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Re: '01 4.3 into an '85 replacing 2.8: questions

nothing on/for your 2.8 will fit that 4.3.

you wont need a flywheel unless you go manual trans. if you go auto trans you need a flexplate.

going to a bigger eng you will have to redo the exhaust.

if go carb you will need a 500 cfm carb and NO bigger unless you want trouble.

you will need a HEI dist for a 4.3 V6. according to edelbrock website it looks like a 2111 intake for a vortec 4.3 V6 is what needed.


good luck with your swap.
Old 08-11-2012, 10:45 AM   #3
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Re: '01 4.3 into an '85 replacing 2.8: questions

thanks for the reply. since i posted that, i've searched the forum and found that it's going to be a draw pretty much on either going with a 4.3 swap or dropping in a rebuilt 3.4.

i have a tranny that i could rebuild and use with the 4.3.

i also have an extra 60* tranny also, which would need a rebuild.

it's pretty much a toss up and i think i might stick with the 3.4 for ease of install.
Old 08-11-2012, 11:02 AM   #4
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Re: '01 4.3 into an '85 replacing 2.8: questions

3.4 would be better since its a 60 degree eng.

going to a 4.3 IMO would be a waste. if you gonna go thru the trouble of swapping a 4.3 than go V8. same MPG and same headache of 4.3 swap, plus you get that V8 rumble. lol
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