I'm using 7.300 now and by going though alllll the old search posts It seems that with a 560 lift I would need longer ones. I am wondering if this is causing my valve chatter at 3K and up under heavy load.

Whats everybody else using?

 

You must check for yourself. Does not matter what everyone else is running. If your block was decked, you may need a different pushrod. Different heads, same thing.

The chatter is probably from misadjusted valves.

How did you adjust yours?

 

while the car is running. i've been doing it for years but this car has to be retarded -5* for it to not chatter.

 

Im using 8.0 length but you have a roller motor.