Crane's screw-in rocker arm studs eliminate press-in studs pulling out at high RPM and in high valve spring pressure applications. Made from high quality alloy steel, Crane studs are precision machined and heat treated for reliable operation with today's valve train loading. Specially machined threads and shoulder area assures firm and positive rocker arm support with minimum movement or distortion. The 99148 studs are used to convert Chevrolet 60° V-6 80-94, 2.8-3.1L engines with non-self aligning 10mm stud rocker arms to use adjustable narrow body 3/8" stud rocker arms without cylinder head machining. The 99152 stud is primarily used for converting 1991-up Chevrolet V-8 454-502 Gen V and VI cylinder heads to an adjustable valve train configuration (with factory pushrod guideplates) without cylinder head machining. Review products and applications. 3/8" Rocker Arm Studs Pkg/2 99148-2$19.60 7/16" Rocker Arm Studs Set/16 99152-16$99.20 3/8" Rocker Arm Studs Set/16 99156-16$56.00 7/16" Rocker Arm Studs Set/16 99157-16$64.00 7/16" Rocker Arm Studs Set/16 99159-16$56.00