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  1. #1
    Registered BOOSTEDSCARAB's Avatar
    My Boats:
    1980 Mirage 9M-SS
    Join Date
    Jun 2005
    Tempe Az

    Reverse Rotation Crank- Difference?

    Does anyone know the differences between a standard rotation crank and a reverse rotation crank?

    I'm building up 2 350's stroked to 408's and need some info.

    Thanks all!

  2. #2
    Rob VIP Member Strip Poker 388's Avatar
    My Boats:
    Hustler 388
    Join Date
    Aug 2001

    Re: Reverse Rotation Crank- Difference?

    I belive the crank is the same ?The differance is in the cam shaft with firing order.


    Boost makes up for Cubic Inchs

  3. #3
    Registered KNOT-RIGHT's Avatar
    My Boats:
    Turbine 46 Skater
    Join Date
    Dec 2002

    Re: Reverse Rotation Crank- Difference?

    Hmm... not sure about that,
    The crankshaft is either
    crossed drilled or the oil holes are drilled so that when the
    cylinder fires the oil hole in crank is facing up torwards
    the cylinder. Thereticaly Providing a Actual film of oil the
    downward force of the rod bearing will ride on.

    My Counter Crank was crossed drilled . It is a
    Sonny Bryant Billet which is knife edged on the wrong
    side telling me it started life in a normal application.

    Dont really think it makes a big difference.
    Providing there is enough oil pressure and proper clearence.
    Next time I have a bottom end apart ill take note on where
    the oil feed is for the rod bearings.
    (Hopefull not mine)
    Here is a recent Thread on it

    Hope this helps

    difference between reverse and standard rotation motors...HELP

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