Page 220 of GM Performance Parts 2006 Catalog by GM Parts Direct

Rocker Adjusting Nut A Pushrod Guide Plate (3/8") C Rocker Arm Stud Kit (1960-1990 engines) B 218 NOTE: ROCKER ARM STUDS ACCESSORIES A. 3896648 Rocker Adjusting Nut Positive locking 7/16-20 nut for all big-block V-8s. B. 12495498 Rocker Arm Stud Kit (1960-1990 engines) Strong, 7/16" diameter screw-in studs are built to stand up to stiff valve springs and high-lift camshafts. Suitable for all high-performance and competition applications. Kit includes 16 pieces. For single stud usage, use P/N 3921912. 12495518 Rocker Arm Stud Kit (3/8" x 7/16") (not shown) Designed for 1991-and-newer Gen V and Gen VI heads when adjustable tappets are desired. Heat-treated, 8720 steel stud has a 3/8-16 thread that screws into the head and a 7/16-20 upper shaft for the rocker arm nut. Use with rocker arm kit P/N 12368085 only. For single stud usage, use P/N 12368941. 10114123 Rocker Arm Stud Kit (Gen V style) (not shown) Used on the Gen V engines and holds the non-adjustable rocker arms in place. GUIDE PLATES C. 3860038 Pushrod Guide Plate (3/8") Designed for all 1960-1990 iron and aluminum cylinder heads with 3/8" diameter pushrods. Slotted style with hardened steel construction aligns rocker arms with valve stem tips on bigblocks splayed-valve head. Eight required for each engine. Use with screw-in rocker stud P/N 3921912. 3879620 Pushrod Guide Plate (7/16") (not shown) Similar to guide plate described above, but for use with heavy-duty 7/16" diameter pushrods. 12562369 Pushrod Guide Plate (Gen V 454/502 Style) (not shown) Used on all Gen V 454 and 502 engines with 3/8" diameter pushrods. CHEVY BIG-BLOCK V-8

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