I Dynoed my '85 yesterday and pulled 200.1 RWHP and 252.6 Torque on my little near stock 305... is there a way to figure flywheel HP? isn't it about 30% loss in the drive train? I know its probably not exact, but just tyring to figure a ballpark...

 

Why? Flywheel HP means nothing unless you're constantly moving the engine to other vehicles. It's the RWHP that does the final work. Drivetrain loss depends on too many variables. Type of transmission and differential. Grade of oil in each etc all affect drivetrain loses. You're never going to get a 0% loss so doing whatever you can to increase RWHP is all that matters.

Have you had it to the track yet? Assuming your car with driver is 3500 pounds, you should run 15.1 ET

 

Should be about 250hp and 315tq.Not too shabby.

 

They generally figure about 20% loss through the drivetrain. So 200hp at the rear wheels is about 240 at the flywheel.