The .509, i personally like this cam, works really good for a bracket cam for its low price, they are also nice for a street car, but only if you don't mind building the engine/drivetrain around it to get the full potential out of it, for such a small lift, they are very aggressive with lots of overlap & dur. & .50", but not really a good choice for the adverage street cruiser with a mild combo, your overall combo on the car is conservitive, so stay conservative on the cam, you'll be much happier.