Alright well, I’m a bit drunk, and I sense I’ll be contributing to this thread late into the night. My friend bought a Trans Am with a Pontiac 400 that supposedly had 400hp. He ran a 13.59 at 3675 pounds. Equates to a measly 335 hp. I don’t believe it could push 400, without porting. For that reason I believe 400 Buick’s have more mild power potential, than the same Pontiac build.