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Thanks for the input, engine builder says .050, I've heard .020 to .040, but going to get a pushrod checker from engine builder, and hopefully be around 40 to 50, and yes they are adjustable rockers .
OK did it again, lifter back side of cam, top of lifter to top of cup is .249 the undid rocker no pushrod top of lifter to top of cup is .128, so o think that gives me 121 thousand preload? am I wrong
They way I did it was put the lifter on the back side of the cam, measured top of lifter to top of lifter cup then subtracted top of life to retaining clip, probably not the correct way to do it. Would that be close though
My 413 did the same thing, ended up being too lean on primary jets, may not be your issue but sounds like it could be, light throttle motor surged give it more gas and would go away until light throttle, just a thought