1964 GMC 1500 "crustine" semi- build.

[TJ's Chevy]

Originally Posted by duallyjams

Hate to see the V6 go but it happens.

You could just adapt the nv4500 behind the V6 and swap out the rear to 3:54, that would definitely help with fuel millage and highway speed but unfortunately it would not have the get up and go of the 454.

The last 454 I had in a truck only got 10mpg, it did not matter if it was going up a mountain or going down, towing or just coasting.

Yeah, that's the main issue is the get up and go. I love cruising with the truck but I also like towing or hauling with it and anything I pull slows this ol girl WAY down. If I could find a 401 or 478 for under $1500 bucks I'd happily swap one in but it seems lately all I can find is a dirty barn find that's badly over priced.

Fuel mileage isn't to much of a big deal for me if I can make 400 hp and get the same economy haha

We'll see, I'm looking back now wishing I would have searched harder for a bigger v6.