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Username Post: 4.3 V-6 in a street rod        (Topic#357342)
Posts: 6

Reg: 07-22-16
07-23-19 10:46 AM - Post#2771376    

I have a street rod with a 5.3 V-8, but I need more room for cooling fan. I'm wanting to ran A/C. I do not want to cut the firewall and move the engine back.So I was thinking of a 4.3 V-6, but which one?


Senior Member
Posts: 1700

Loc: Whitewater, CO
Reg: 05-25-01
08-21-19 08:45 PM - Post#2773793    
    In response to vintagecarguy

Those are a dif series motor and not really a direct swap. But, it is easy enough done.

The original 4.3 can be had w/a mechanical FP, carb, and HEI. If you get it from a PU, possibly factory headers. I THINK, these ended in '86

The next series...possibly the same series as the best ever 350...a TBI. '87-9? They can be swapped to a carb and a HEI, or run TBI, w/a Howell TBI kit, or put together stock Chevy stuff. There are also other fuel injection kits out there.

The current motors seem to be better than these, by reputation, but those motors would run 200-250K w/no issues, fairly easily. Time will tell.

The next series after that...the CPI/Vortec motors...they are prone to leaking intakes and fuel spiders in the intake, which leads to ruined rings and etc in the cylinders that are drenched w/the leaking gas. These motors put out the most HP/Tq.

A 4.3 is a 350 w/2 cylinders cut out...the front of the motor is the same as a 350, just farther back. The rear of the motor would end in the same place as your trans. Here is an asset...same motor mounts as a 350.

Therefore, a 4.3 would give you several inches of clearance in the front. I am not sure how much...but it has a 4" bore, and I assume 1/2" on each side of the bore is, at least 5" shorter.

An electric fan would handle your cooling and does on my Volvo, Odyssey and Camry.


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