 Power rating on the 305 TBI stayed same at 170 hp(127 kW) at 4,000 rpm and 255 lb⋅ft (346 N⋅m) at 2,400 rpm.Rumors say that these numbers were slightly underrated by GM, but this has not been investigated.Beginning with the 1991 model year, GM pioneered some modified assembly techniques with the F-body Camaro and Firebird which were carried forward into the fourth generation.