How do I do this??? I need to dial out the overlap or as much as I can because I am using the NOS kit. Do I need to retard the exhaust and advance the intake? Advance the exhaust and retard the intake? Or is it the total opposite like retard both intake and exhaust or advancing both??? I need help soon guys, the races start this Saturday and I have the last appointment at the dyno on Friday. I am running a 125 shot on the NOS kit # 02040 and on the dyno I am only gaining 73 hp. I think that I am losing the other 50hp thru blow-by, because of both intake and exhaust valves being open at the same time.

 

What motor do you have? Is it built at all? (is 125 a good idea if its not?)

What bottle pressure are you running? Do you have a bottle heater?

Steve

 

The easiest way to dial out a cam ( I assume to make it less aggressive) is to increase valve tappet clearance.
As you increase the valve clearance, the slack between the rocker arm and cams become bigger thereby making the lobe "smaller".
But this is a poor way of doing it..... it will result in a noisy valve train because the rocker arm will be making tapping noises.