[Gaz64]

Knowing your crank hp and rear wheel horsepower shows what is typical for driveline loss.

25-30% would be considered normal.

To get your 450 rwhp, you'll need about 600 flywheel.

Also shows how many dynos lie.

Compression pressure is related to compression ratio AND cam timing.

Does your mechanic know what cam you have before stating it should have "xyz" compression pressure?