NEW screw-in rocker arm studs SpeedPro #MR-1867RS set of 16 pcs, enough for one engine. Virtually break proof, highest quality steel for race, street, or stock. Fits all BBC big block Chevy Chevrolet . Rocker arm ends are 2 inches long, which is 1/4 inch longer than stock for a little more adjusting nut engagement. Rocker arm ends are std 7/16-20 threads which fit all rocker arm nuts including PolyLocks. Head screw-in ends are std length 7/16-14 threads which fits all BBC heads. The extra length is at the rocker arm end, not the head end. Summit racing price is $144/set, but I am no longer building engines so my price is only $75 for this NEW set. Free shipping to lower 48. Thanks for looking.