Pre 2008?- 335-345
After 2008 - 390
345
It is rated at 390
390
425 hp
345
345 horsepower
The 5.7L is rated at 345
345
400 horsepower
345hp
390
The Chevrolet S 10 4.3 liter engine horsepower is dependent upon several different factors. The average 4.3 liter engine has approximately 165 horsepower.