An old set of Isky ductile iron adjustables. Thanks for the help, if I can get a measurement, I hope to find a set at our end of the year track swap meet.
I can't give you a measurement cuss I'm using Hughes roller tip rockers and I'm not sure anyone can. There are just to many deviations like different head gasket thicknesses between your engine and other peoples, slightly different lengths between different manu. of solid lifters and on and on. I think you're stuck measureing, contact Smith or Hughes and they will send you an adjustable pushrod, set it in place on just one lifter/rocker pair, as per their instructions, then courier the rod back to them and you should have your 16 push rods within 5 business days.