I got a cam with a .515/.515 lift int/exh and I was curious to know if I will need to get +.100 pushrods because of the high lift. I intend on using 1.6:1 rockers and new valve springs with a max lift of .550, could I use stock length pushods or would I need to use the lengthed ones? I plan on using hydraulic roller lifters that are stock size.

 

Running 0.525" lift here with stock pushrods for 30K+ miles, the valvestem contact at rest and max lift was right where Vizard's book said it should be.

 

ok, cool. I will stick with stock length then.