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4.3L swap

19K views 19 replies 9 participants last post by  xtreme_lyb  
#1 ·
Does anyone see any problems swapping in a 4.3L in place of my 3.5 auto? There seems to be more 4.3s available and I don't care if it's only a V6. I can use the same bell housing as the 4.8/5.3/6.0 from what I can tell.
Does the 4.3 have any bad vices?
 
#3 ·
I would think the 5 cylinder Atlas would be better than the 4.3...
Good luck with your project !!!
 
#4 ·
I have the 4.3 in my 2001 S-10 Xtreme 98000mi, it runs like a top
you would prob need a late model one so the PCM could be flashed.
A truck one mite work with a modded wire harness, 4L60E and PCM.
 
#5 ·
4.3 is a heavy slug of a motor........ why not drop in a 4.8 LS based motor and get some real power and torque
 
#12 ·
I'm in Edmonton. The ones I found are out of 03 and 04 half tons, located at Central Auto and Truck Parts. I use car-part.com to search wreckers for parts.

For whatever reason, 1999-04 and 05-MY07 are listed differently but I don't think there are any differences from 99-07. Someone correct me if I'm wrong.
 
#16 ·
I6/4.2 is too long for the 355, unless you want to move your radiator to the bed of the truck
 
#17 ·
I thought the 4.2 might be too good to be true. It looks like I'm back to the 4.8 or the 3.7. Do most valve probs on the Atlas show up on only low mileage motors? I can get a 2007 3.7 with 180,000 km on the meter. Is there any way to do a rough check on the valves on a junkyard
non-running motor without opening it?