Chevy V-6 2.8, 3.1, or 3.4?

The 2.8 liter engine was a very popular engine for GM. It was used in two and four wheel drive s10s from 1982 to 1993. Lack of power and weak bottom end were it's main flaws. S10s used the carberated version of the 2.8 until 1985, and had the provisions for the mechanical fuel pump. The 3.1 was in the second generation of the 60 deree blocks offered from GM. Used mainly in front wheel drive applications, these engines are available aftermarket from various companies as a replacement for the 2.8 liter.Last but not least, the 3.4 liter. This was a late entry for the GM crew, but not the least in any way. This little motor was a power house. It was introduced i believe in 1991 in the camaros. In multi-port trim it made right at 200 horsepower (depending on the model). These engines had the provision for a distributor, but none for a mechanical fuel pump. Aftermarket intakes, including four barrel, and cams for all three engines are commercially available, as are headers and carberetors. I would use a 3.4 block out of a 1994 camaro with an aftermarket 4 barrel intake and a 390 cfm carb with a mild cam for your application.

The 2.8 was used in the early S10 truck. It was carbureted and had a simpler HEI ignition system. The 3.1 & 3.4 are later model versions and have EFI and computer controlled engine management.

I dont know if any of the Heads, manifolds, ignition from the 3.1 can be added to a 3.1 or 3.4. I believe they use the same block so this may be possible.