Valve rotators

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500, 472, 425, 368 Discussion, Valve rotators in Cadillac Engine Discussion; None of my 500s seem to have valve rotators; anyone know what year Cad started using them? If 77-79 425, ...
  1. #1
    BRUCE ROE is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado
    Join Date
    Jun 2009

    Valve rotators

    None of my 500s seem to have valve rotators; anyone know what year Cad started using them? If 77-79 425, can the setup be transferred over to the 70-76 engines? thanks, Bruce Roe CLC # 14630

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: Valve rotators

    Bruce, Our Olds 455 boat engine conversions (70 - 75 blocks) were originally equipped with valve rotators. When we do rebuilds and head/lifter/cam changes we leave the rotators out and go to standard retainers. With hardened valve seats and decent roller tip rockers the rotators aren't necessary - more trouble than they're worth, and they add a significant amount of moving mass to the valve/spring assembly.

  4. #3
    deVille33 is offline Cadillac Owners Connoisseur
    Automobile(s): 1977 Coupe (blue), 1977 Coupe (yellow), 1977 Coupe (green)
    Join Date
    Mar 2006
    Western Massachusetts

    Re: Valve rotators

    Provided your guides, stems, locks, rockers and retainers are in good condition, with no set wear ( a wear-in spot that starts a groove ) the valves should rotate or dance while in operation. You can witness this if you set your timing using a timing light with the valve covers off.

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