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Big Block Chevy

Big Block Chevy

3 Item(s)

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  1. 8" 396/427 Big Block Chevy SFI Harmonic Damper (Int.)

    Part # 90004

    This is our standard 8" damper for 396/427 (or any internally balanced big block Chevy engine) and is one of the few dampers we make that does not match the original O.E size which was 7" on these engines. Using the 8" diamer allows interchangeability with out 454/502 dampers.

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    Out of stock

  2. 8" 454/502 Big Block Chevy SFI Harmonic Damper (Ext.)

    Part # 90005

    These dampers are the identical dampers to the 80004/90004 but are fitted with a bolt-in counterweight to provide the proper imbalance for the 454/502 externally balanced engines. Remove the counterweight and it can be used on any natural balance (internal) big block Chevy engine.

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  3. 7.6" 454/502 Big Block Chevy Lightweight SFI Harmonic Damper

    Part # 90037

    Again, these dampers are identical to the 80036/90036 but include a bolt-in counterweight to provide the proper imbalance for the externally balanced engine. The 80037 is 4.2 pounds lighter than 80005 and the 90037 is 4.8 pounds lighter than 90005

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