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Thread: 455 olds installing cam and roller rockers

  1. #1

    Join Date
    Dec 2019
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    Russells Point
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    455 olds installing cam and roller rockers

    Good evening,
    I have a stock (Far as I know) 455. I would like to upgrade cam. Nothing to radical. So my first question is what size lift is stock in marine motor? .474??? If so could I go to .510 without piston interference? And second I have a set of roller rockers that id like to use. When I remove the stock rocker bolts can I directly replace with rocker studs or will I need machine work. I plan on upgrading push rods and installing guide plates at that time. Thank you for any help and info. (I have built a few sbc chevys but this is my first olds).

  2. #2

    Join Date
    Aug 2011
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    Hubbardston, Mass
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    Re: 455 olds installing cam and roller rockers

    Im not sure what the original cam would have been , but i installed a Comp marine magnum flat tappet with Harlan Sharp 1.6/1 roller rockers and a bunch of other stuff .










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  4. #3

    Join Date
    Dec 2019
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    Re: 455 olds installing cam and roller rockers

    Looks like pistons are cut for valve lift though. Stock arnt I don't believe.

  5. #4

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    Aug 2011
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    Hubbardston, Mass
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    Re: 455 olds installing cam and roller rockers

    I should have mentioned those are forged 10 to 1 flat top pistons . Stock olds 455 pistons are dished, valve clearance wont be an issue .

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