[cal30_sniper]

Originally Posted by sbc383rulz

your missing the point, the 4bt came factory in bread trucks that weight alot more than your suburbans GVWR. the comparable 4BD from isuzu that i know a little more about the trucks has a gvwr of over 15K. im not saying it will be fast but it will keep up with a stock 6.2 i would imagine, do a little work to the cummins it will make more low end torque than a 6.2 is capable of producing due to engine design.

I'm not missing your point. We're talking about a 105hp engine here. You keep bringing up this bread truck thing. Sure, it will get a bread truck to move around at the speeds you would expect a bread truck to move around at: Slow. I don't know of anyone that wants to be limited to crawling speed in something they might drive very often. Even the 6.2L in the late 80's burbs had nearly 150 hp. Sure it's only a 50hp difference, but that also equals a 150% increase over the 4BT. And the 6.2L is not known for going anywhere fast even then.

4BT swaps are awesome in Jeeps and light trucks. I looked into a 4BT burban swap back when I ended up going with the 350 Vortec. From what I found on the 4BT, there's no way you could convince me to put one in a full size truck. It makes a lot of torque down low compared to engines similar to its own size. Then again, it still weighs as much as a BBC, so it's only small in displacement. If you wouldn't consider putting a 305 in your 3/4 ton suburban, you probably wouldn't want a 4BT either.