What v6 engine come in a 1995 Chevy s10 blazer?

The 1995 Chevy S10 Blazer did *not* offer a V6 engine as a standard option. The available engines were a 4.3L V6 (in later years of the S-series) and the 2.2L four-cylinder. The 4.3L V6 was introduced later in the S10's life cycle. A 1995 model would have had either the 2.2L 4-cylinder or possibly (depending on trim level and options) a 4.3L V6. It's critical to check the vehicle's documentation to know for sure.