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Billet FM2121PC SBC Mid Mount Serpentine Conversion Kit, Keyway Shaft

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Billet FM2121PC SBC Mid Mount Serpentine Conversion Kit, Keyway Shaft

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What's in the Box


Genuine Billet Specialties style, quality, fit and finish are engineered into these serpentine conversion kits. All brackets and pulleys are machined from 6061-T6 billet aluminum & polished to a mirror finish. Designed to bolt right on and align correctly the first time. Includes stainless steel hardware.

Designed for use with:

  • Long water pump ('69-'86 style)
  • GM 10SI/12SI alternator (passenger side)
  • Saginaw power steering pump ('75-'77 Chevelle w/ V8)

Kit Includes:

  • Polished billet aluminum top mount alternator bracket
  • Polished billet aluminum alternator pulley with fan & nose cone
  • Polished billet aluminum power steering pump bracket
  • Polished billet aluminum power steering pulley
  • Polished billet aluminum water pump pulley with nose cone
  • Polished billet aluminum crankshaft pulley
  • Polished stainless steel turnbuckles
  • Stainless steel mounting hardware

Note: Serpentine belts are not provided in kit.  Recommended Alternator Belt:  Goodyear 6 Rib # 4060407 (40.75") to #4060410 (41") or Dayco #5060408 (40.8") to #5060410 (41").  Recommended Power Steering Belt:  Goodyear 6 Rib #4060355 (35.5") or Dayco #5060358 (35.8")

910-13271 Instructions (PDF)

Get the correct pulleys for your application by learning which water pump you have as explained in our tech article. SBC - Short vs Long Water Pump.

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