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PARTS INTENDED FOR COMPETITION USE ONLY.
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Racing Flag

PARTS INTENDED FOR COMPETITION USE ONLY.
Click for more details.

SMALL-BLOCK ROCKER ARMS AND COMPONENTS

12495490

ROCKER ARM KIT, STEEL, 1.5 RATIO (SET OF 16)

  • Self-aligning, high-quality rockers have a nominal 1.5:1 ratio
  • Includes 16 stamped steel rockers with pivot balls and nuts
  • Use P/N 10089648 for single service part; for 3/8" studs
  • Not recommended for mechanical lifter camshafts

19210728

ALUMINUM ROLLER ROCKER ARM SET, 1.5:1 RATIO

  • Resemble the ones used in the 1996 Corvette LT4 engine
  • Trunnions have been machined to fit early model 3/8" rocker studs
  • Will accommodate up to 0.575" valve lift
  • Set of 16, 3/8˝ stud 1.5:1 ratio roller rockers
  • Use P/N 19210724 for single service part

NOTE: When using a high-lift camshaft, check valve spring coil bind, retainer-to-seal clearance, and piston-to-valve clearance. Check for adequate pushrod clearance when using on cast-iron heads. It may be necessary to remove valve cover drippers for proper rocker arm clearance.


19210729

ALUMINUM ROLLER ROCKER ARM SET, 1.6:1 RATIO

  • Resemble the ones used in the 1996 Corvette LT4 engine
  • Trunnions have been machined to fit early model 3/8" rocker studs
  • Will accommodate up to 0.575" valve lift
  • Set of 16 3/8" stud 1.6:1 ratio roller rockers
  • Use P/N 19210725 for single service part

NOTE: When using a high-lift camshaft, check valve spring coil bind, retainer-to-seal clearance, and piston-to-valve clearance. Check for adequate pushrod clearance when using on cast-iron heads. It may be necessary to remove valve cover drippers for proper rocker arm clearance. P/N 19210729 cannot be used on ZZ3 engines with orange valve springs.


19210725

ADJUSTER NUT FOR ROLLER ROCKER ARM

  • 3/8" adjustment nut
  • Used on both aluminum rocker arm kits P/N 12370838 and P/N 12370839

19210731

“KOOL NUT” (SINGLE)

  • These special rocker arm nuts are used on GM Circle Track engine P/N 19258602, 88958602
  • Can be used with any stamped-steel rocker arm

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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance parts that are emissions-related may not meet U.S., Canadian, and state and provincial laws and regulations relating to motor-vehicle emissions. These parts are designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. Visit www.chevroletperformance.com/emissions for more details.