I think it was something like 275 HP stock, but I know im incorrect by a few #'s. Someone else should chime in and tell you correct HP #'s. -Cody
HP depended on what car it was put in. 68 GS350 "rated" at 280, being a 4bb w/dual exhaust. A 2bb Skylark w/sgl exhaust rated lower. I'm not sure of those #'s.