Are there any difereces in 2.8L Chevy engine?

Answer 1

Yes there are differences in the Chevy 2.8L engines. Without intending to do an

exhaustive list, here are a few differences:

The early engines were designated X and Z. The X engines were about 105 hp, the Z engines were around 130 hp. It varied some through the years. The X and Z engines all had carburetors, cast iron heads and distributor ignition. Engines used in Citations, Chevy Celebrities and Pontiac 6000 were for front wheel drive. Engines used in Camaros, Firebirds were rear wheel drive engines. Yes, there is supposed to be some minor differences in the engine blocks. They may have been used in other models, I'm not sure.

In 1985 the Z engine was replaced with the W engine. It was fuel injected but still used cast iron heads and distributor ignition. It also was about 130 horsepower. It was used in 1985 & 1986 Chevy Celebrities and Pontiac 6000s as front wheel drive, and Camaro and Firebird as rear wheel drive. It continued in Camaro and Firebird at least until 1988.

1987 the W engine was redesigned for Chevy Celebrities and Pontiac 6000 with aluminum heads, the fuel injected system was modified some and it changed to distributor less ignition. That engine became the 3.1L engine in Chevy Celebrities and Pontiac 6000 in the 1990 model year. It also may have been used in other cars, not sure about that.