depends how many k engine wear and efi or carb simple way to test is take it to a dyno. i have a 1988 firebird with a 305 efi and it has 230hp
Advertised horsepower is : 160 HP @ 4400 RPMs.
1986 305 TPI 190 HP / 285 Lb.Ft
Base 305s in '86 had 150 hp, the SS models had 180
Advertised horse power is 160 HP @ 4400 RPMS. STOCK.
Advertised Horsepower from factory is 160 HP @ 4400 RPMs.
A Chevy 305 produces:130 HP - 250 HP A stock 86 305ci Regal will be the 165 HP or 190 HP version.
305 hp
180hp
Base 305 4bbl (170 hp), optional 305 TPI (215 hp) or 350 TPI (225 hp)
38 HP stock for the 85-86. *40 Hp stock for 85/86
The 305 "HO" was actually dropped after 1986. In '87, the base 305 TBI was rated at 170 hp, the 305 TPI was rated at 215 hp.
1989 was 160 hp 1998.5 was 215 hp 2003 was 305 hp