[frw]

I know that a number of people have done the V8 swap on the Astro, but I was wondering what engines other than the 5.7 fits the Astro? Is there any other engines that match up with the transmission? I would like to put a newer more powerful V6 in my Astro if there is one that is an easy swap. If not what would be your suggestions for a possible rebuild on the 4.3 to pull some more HP/torque from it while keeping it streetable?

Thanks

 

[Gary]

Knowing the yr of your van and if AWD would help.

 

[frw]

Oops 2002 awd

 

[Mr_Roboto]

Honestly, the only engine that made more power than the 96-05 Vortec 4.3L was the 92-95 "W" motor or the early 90s "B" motor. TBH, it would be easier just to cam the motor you have than to gain 20hp or 5hp respectively.

 

[frw]

The rebuild idea was something that I had considered. Higher compression, longer stroke and a slightly hotter cam with a reflash of the computer to make it all work might be the best solution.

 

[frw]

What about the 4.2 from the trailblazer/envoy? It has 285HP and I believe 265ft/lbs of torq. There should be plenty available. Being an inline 6 would it be too long and does it match up to the transmission? A four speed was standard on those vehicles, but I don't know if it was the same one as the Astro.

 

[Mr_Roboto]

You may have to change the bellhousing/converter to work, not 100% sure. The actual tranny should work though. Besides that, I am also not sure on the length I believe it will be too long without doing something like a pusher fan but you'd have to measure and check. I've never seen an L6 van before tbh.