They're rated at 225 at the flywheel.. Now you have to add in age, wear and tear on the motor, etc. etc. I'd say you'd probably put down ~190 hp 250tq.kennybo said:I have an 87, GT, T-Top, 5.0 HO, 5 Speed. If I'm not mistaken, I beleive they have 225 HP from the factory. I was just wondering what the most practical and affordable way to reach 300 HP would be?