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. These studs are 2 inches long, which is 1/8 to 1/4 inch longer than stock which gives a little more adjusting nut engagement. Rocker arm ends are 7/16-20 threads which fit all rocker arm nuts including PolyLocks. Head screw-in ends are std length 7/16-14 threads which fit all BBC heads. The extra length is is at the rocker arm end, not the head end. Summit Racing price is $144 for these, but I am no longer building engines, so my price is only $70 for this NEW set. Free shipping to lower 48. Thanks for looking.