Chevy Small block V8
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 chromemoly steel, for maximum-performance racing engines. Note:
TECH Note: Heavy-duty pushrods for small-block 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 longer-than-stock valves are installed. GM Performance Parts pushrods are case-hardened for use with pushrod guide plates. SMALL- BLOCK PUSHRODS
Part Number Material Diameter Length Usage Description
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.
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.
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" 7.896" Special (1) Chromemoly 1-piece design racing pushrod SMALL- BLOCK GUIDEPLATES
Part Number Description Technical 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 engineassembly P/N 10185072. Four required per V-8 head. ROCKER ARM STUDS 12495497
Screw-In Rocker Stud Kit (3/8") (not shown)
• 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
• Won’t pull out of their bosses under high load
• Kit includes 16 pieces, for single stud usage, use P/N 10168410
• Lower thread section is 7/16-14 Note:
Screw-in studs can be installed on heads originally equipped with pressed studs by machining and tapping the stud bosses. E. 12371058
Screw-In Rocker Stud Kit (LT1, LT4 Style)
• 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
• Lower thread section is 7/16-14 3921912
Screw-In Rocker Stud (7/16", Big-Block Style) (not shown)
• Beefy 7/16" big-block V-8 rocker studs
• Improve 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 | 
