Page 165 of GM Performance Parts 2006 Catalog by GM Parts Direct

163 Heavy-Duty Pushrod Kit (0.100" longer than stock) SMALL-BLOCK GUIDEPLATES Part Description Technical Number Notes 3973418 Pushrod Guide Plate (cast iron head) For use with production and Bowtie cast iron cylinder heads with screw-in studs. Can also be used with aluminum Bowtie V-6 head. Should not be used with self-aligning rockers. Pushrod slots are 0.325". For 90 V-6: Use on cylinders 1, 2, 5 and 6; guide plate must be ground to clear valve cover hold-down bolts. Four required per V-8 head. 14011051 Pushrod Guide Plate (aluminum Bowtie head) Hardened steel guide plate has the correct pushrod spacing for aluminum Bowtie heads. Should not be used with self-aligning rockers. Pushrod slots are 0.365". Four required per V-8 head. 10111771 Pushrod Guide Plate (Corvette aluminum head) Non-hardened guide plate for use with Corvette aluminum cylinder head assembly P/N 12556463 and 350 HO engine assembly P/N 10185072. Four required per V-8 head. NOTE: ROCKER ARM STUDS 12495497 Screw-In Rocker Stud Kit (3/8") These 3/8" studs fit all high-performance small-block V-8 and 90 V-6 Chevrolet cylinder heads machined for screw-in studs and using guide plates. Unlike pressed studs, these screw-in studs wont pull out of their bosses under high load. Kit includes 16 pieces. For single stud usage, use P/N 10168410. The lower thread section is 7/16". Screw-in studs can be installed on heads originally equipped with pressed studs by machining and tapping the stud bosses. F. 12371058 Screw-In Rocker Stud Kit (LT1, LT4 style) These 3/8" studs are used on all late-model LT1, LT4, and any head not using a pushrod guide plate. Kit includes 16 pieces. For single stud usage, use P/N 12552126. The lower thread section is 7/16". 3921912 Screw-In Rocker Stud (7/16", big-block style) Beefy 7/16" big-block V-8 rocker studs improve the valvetrain stability of any small-block V-8 or 90 V-6 racing engine by minimizing rocker stud flex. Fits any small-block V-8 or 90 V-6 cylinder head machined for screw-in studs. Requires rocker arm for 7/16" stud. SMALL-BLOCK PUSHRODS Part Number Material Diameter Length Usage Description 12371057 1010 steel 5/16" 7.824" Flat tappet (16) Heavy-duty heat-treated .075" wall, hardened tip inserts. +.100 long. Use 366277 for single piece. 366277 1010 steel 5/16" 7.824" Flat tappet (1) Heavy-duty heat-treated .075" wall, hardened tip inserts. +.100 long. 12495491 1010 steel 5/16" 7.724" Flat tappet (16) Heavy-duty heat-treated .075" wall, hardened tip inserts. Standard length. Use 14044874 for single piece. 14044874 1010 steel 5/16" 7.724" Flat tappet (1) Heavy-duty heat-treated .075" wall, hardened tip inserts. Standard length. 10046173 1010 steel 5/16" 7.122" Hyd. Roller (1) Heavy-duty heat-treated .060" wall, standard length. For use in early ZZ-series engines with guide plates 12371041 1010 steel 5/16" 7.122" Hyd. Roller (16) Heavy-duty .060" wall, standard length. For use in 2nd design ZZ-series engines without guide plates. Use P/N 10241740 for swingle piece. 10241740 1010 steel 5/16" 7.122" Hyd. Roller (1) Heavy-duty .060" wall, standard length. For use in 2nd design ZZ-series engines without guide plates. 10134309 4130 steel 5/16" 7.796" Special (1) Chromoly 1-piece design racing pushrod. Screw-In Rocker Stud Kit (LT1, LT4 style) F NOTE: PUSHRODS GM Performance Parts offers a complete line of heavy-duty pushrods for most GM engines. They are designed to deliver outstanding performance in high-performance street and competition applications and are available in two materials: 1010 mild steel, which is suitable for high-performance street cars, power boats, street rods, and limited competition applications, and 4130 chrome-moly steel, for maximum-performance racing engines. TECH NOTES: Heavy-duty pushrods for smallblock V-8 and V-6/90 engines are available in standard and 0.100" extended lengths. Longer pushrods can be used to restore the correct valvetrain geometry when using a high-lift camshaft with a small base circle. Extra-long pushrods also are recommended when longerthan-stock valves are installed. GM Performance Parts pushrods are case-hardened for use with pushrod guide plates.

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