The horse power for the 5.3 litre V8 is 275 for 1999.
285 horsepower
315 horsepower stock
The horsepower of a GMC Sierra is 355 hp.
250 hp
403
270hp
295hp
The GMC Sierra 3500 truck was first created in 1998 for the 1999 release. The GMC Sierra 3500 version from 1999 to 2007 is considered the classic version.
The 2003 GMC Sierra-2500HD's engine produces 300 hp @ 4400 rpm.
The 2002 GMC Sierra-2500HD's engine produces 300 hp @ 4400 rpm.
The 2013 GMC Sierra-2500HD's engine produces 360 hp @ 5400 rpm.
The 2009 GMC Sierra-3500HD's engine produces 312 hp @ 4400 rpm.