this doesn't look like a very common swap and i'm wondering why. the 4.3 should have many interchangeable parts with the 350 not to mention the 4.3 is a lightweight beast. i had one in my 98 c1500. i remember hauling my maxima on a trailer from Macon to Atlanta doing 80mph the whole way up hills in the fast lane. plus i have recently acquired 2 vortec 4.3V6s. I though i might put them to use. anyone have any input? this is all i've seen on the swap https://www.thirdgen.org/forums/v6/420100-4-3l-v6.html

 

https://www.thirdgen.org/forums/engi...ech-third.html

Post #11.

 

Hmm..Very interesting. I recently met a fellow third gen guy and he mentioned the 4.3 swap. Prior to that I hadn't even thought about it.

 

i have a complete 99 astro van that was abandoned. all i know about the engine is that the distributor was missing. it turns over and thats all i know. if it runs good i think i will use it. i guess i'll have to find a way around the vats. if i decide to use a carb im going to port the heads, use bigger valves and regrind the cam. 300hp sounds nice. that edelbrock intake doesn't look up to that task.