This typically yields a number about 20-25% lower than those gross numbers.
Sae net is power at flywheel with all those components on engine as it would be in vehicle. The difference is sae gross is power engine makes with no accessories (not even water pump), no air filter and no exhaust off their very large long tune headers that would never fit in a vehicle and no exhaust. In 1972 car manufacturers switched to sae net numbers which is easily half the reason power numbers listed for vehicles in 1972 were dramatically less than 1971. A lot of engine builders list engines as Sae gross power which is how factory rated motors prior to 1972. When looking at crate engines on line be sure to ask if their engine power numbers are SAE GROSS or SAE NET. Please look at the bottom of page where it says FINALLY about ignition system.
