Alternator, 90 Amp


  • Competition alternator
  • CS121 design housing
  • Serpentine belt pulley
  • Hand-assembled and dyno-tested
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90-Amp Alternator (Competition)

P/N 88958690

– Proven in NASCAR use
CS121 design housing
– Serpentine belt pulley
– Hand-assembled and dyno-tested


90-Amp Alternator

88958690 Chevrolet Alternator


Flywheels with two different diameters are used on Chevrolet Small-Block, Big-Block, and 90ᄚ V-6 engines. Large flywheels are 14″ in diameter and have 168 teeth on the starter ring gear. Small-diameter flywheels are 12.750″ in diameter, with 153 teeth on the ring gear.

This difference in flywheel diameters requires two distinct starter housings. Starter noses used with large-diameter flywheels have two offset bolt holes, while starters for small flywheels have two bolt holes that are parallel to the back of the block. Most Chevy blocks are drilled for both types of starters.

Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to