clevite 77 p bearings on a cast crank?
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clevite 77 p bearings on a cast crank?

  1. #1
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Default clevite 77 p bearings on a cast crank?

    i thought the p bearings were heat treated and for forged cranks? my lil 468 has them in it and the dates are from 1991 on them, but both the mains and rods are p bearings. the cast crank has been heat treated and nitrated, which i found very odd, you don't see that here, most will buy forged before spending alot of money on a cast crank. someone balanced the bottom end and really did a nice job on the crankshaft. just curious , i'm putting p bearings back in it, worked fine for 18yrs

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    just a ski boat with bark Carnivalride's Avatar
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    In Clevite I believe the "P" is for performance and the "H" series is for heavy duty or race applications. If It matters I've always run the "P" in my piece and it's lived since 92.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Carnivalride View Post
    In Clevite I believe the "P" is for performance and the "H" series is for heavy duty or race applications. If It matters I've always run the "P" in my piece and it's lived since 92.
    i've never ran anything but forged cranks in bbc's, i honestly just didn't know

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    LP-25.com Infomaniac's Avatar
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    Nothin wrong with a P bearing on stock cranks. Forged or cast.

    Most aftermarket cranks are gonna require H bearings for the chamfer.

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    Quote Originally Posted by Infomaniac View Post
    Nothin wrong with a P bearing on stock cranks. Forged or cast.

    Most aftermarket cranks are gonna require H bearings for the chamfer.
    knew that about the hbearings, but i wasn't sure bout the p bearings, thanx yall for clearing it up. i've got everything ordered and on its way, man it'd be nice to go a season without building a motor for something

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    Senior Member hotbo's Avatar
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    tom,i have p-bearings in my mill and have for along time,well the first set were clevite,last set were kings.

    my uncles cast eagle crank has p-bearings in it as well and cleared the radius just fine.

    yeah it would be nice to get many years out of a mill without having to turn any wrenches

  9. #7
    Sit N' Spin Jetaholic's Avatar
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    It really doesn't matter what bearings you run in it. I mean after all, it's a Chevy.



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  10. #8
    gn7
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    The P bearing is suppose to have more of a taper from vertical to the part line. Last set I measured it wasn't much different than the H bearings. The P has a flash babbit on the surface than some say it can smuge and or ball up under extreme pressure. Some remove it with scotch brite. CL 77 "P" bearing have been used by all of the big three on cast cast at one time or another.



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    Member MSCobalt220's Avatar
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    Quote Originally Posted by gn7 View Post
    The P bearing is suppose to have more of a taper from vertical to the part line. Last set I measured it wasn't much different than the H bearings. The P has a flash babbit on the surface than some say it can smuge and or ball up under extreme pressure. Some remove it with scotch brite. CL 77 "P" bearing have been used by all of the big three on cast cast at one time or another.
    I've done that with P bearings on blown engines and had no problems . It's the cold scuffing that ruins bearing life. A lot of other factors that outrite ruin bearings .

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