455 horsepower
A 1974 Oldsmobile 455 V8 has horsepower of 275 to 400. The Oldsmobile 455 was last produced in the year of 1975.
350,400 or 455
The 1987 Trans Am didn't have a 455
225 / 250 / 270 / 300 horsepower ( 4 versions of the Oldsmobile 455 - 4 barrel carburetor - listed in 1972 )
Horsepower TV - 2006 Building an Olds 455 was released on: USA: April 2009
225 horsepower - UA engine code or 250 horsepower - UD engine code
There are many ways to increase the 455 horsepower. With a cam/valve train swap and working over the heads (or replacing with aftermarket) you can be in the 500+ range. "Pontiac High Performance" is a great source for information on engine modifications.
You need to specify which model Caterpillar motor you have. 455 is just a horsepower rating - several models were available with a 455 horsepower rating, to include the 3406B, 3406E, C12, C13, and C15.
250
Oldsmobile stopped production of the 455 in 1976. There were no 455s produced in 1987.
In 1968-69 there were 2 different 455 engines. The base 455 put out 375 h.p and the higher compression ratio engine put out 400 h.p.