[Question] GM Piston....
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GM Piston....

  1. #1
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    Default GM Piston....

    I have .30 454 It has Gm pistons. The # on the is 8188 or 14100820.
    Question being, what are the specs on these pistons? I Can't find any info on these.
    Any help is appreciated.
    "Never Trust A Fart"

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    Anyone.....I know it's a holliday weekend, but I know somebody has to be surfing the web with a phone
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    gn7
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    the numbers don't jive lil'
    Not with TRW, or SpeedPro/Sealed Power
    Or GM



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    Quote Originally Posted by gn7 View Post
    the numbers don't jive lil'
    Not with TRW, or SpeedPro/Sealed Power
    Or GM
    Bob, I took that # right off the piston. It could be 8818.
    I guess I could shoot a pic if that would help.
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    gn7
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    8818 doesn't fly either. If you post a pic of the dome, some one will be able to tell you what you have. Just not that many GM/Speed Pro/TRW forgings out there.



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    Quote Originally Posted by gn7 View Post
    8818 doesn't fly either. If you post a pic of the dome, some one will be able to tell you what you have. Just not that many GM/Speed Pro/TRW forgings out there.
    Crap cell phone pic, but here it is.Click image for larger version. 

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    One more....Click image for larger version. 

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  10. #8
    gn7
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    Never seen a BBC piston without a intake valve notch in my life. Not saying they never made one. I've never seen one. I doubt that piston is a GM piston. It MIGHT be a replacement piston for very late 454 like a Vortec.
    It is cast piston. Hopfully running with very very short cam lift and duration. It is anything but a performance piston. If your trying to replace just one, do your self a favor and don't. A full set of decent flat top forged pistons is cheap insurance.

    Have you measured the bore on that piston? The pin looks too low to be a 454. If its smaller than 4.250", then its from a 396. If the pin measures more than 1 5/8 from the top of the piston, to the center of the pin, and closer to 1 3/4 from top to center, its a 427 or 396. Never seen a dished 427 or 396 piston, but that doesn't mean they weren't made either.



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    Last edited by gn7; 07-05-2011 at 06:51 PM.

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    Quote Originally Posted by gn7 View Post
    Never seen a BBC piston without a intake valve notch in my life. Not saying they never made one. I've never seen one. I doubt that piston is a GM piston. It MIGHT be a replacement piston for very late 454 like a Vortec.
    It is cast piston. Hopfully running with very very short cam lift and duration. It is anything but a performance piston. If your trying to replace just one, do your self a favor and don't. A full set of decent flat top forged pistons is cheap insurance.

    Have you measured the bore on that piston? The pin looks too low to be a 454. If its smaller than 4.250", then its from a 396. If the pin measures more than 1 5/8 from the top of the piston, to the center of the pin, and closer to 1 3/4 from top to center, its a 427 or 396. Never seen a dished 427 or 396 piston, but that doesn't mean they weren't made either.
    To many things wrong in that shot? Unless its an early tall block? Even so GN is right to advise spend a few more bucks and replace the set. You get what you pay for and if you don't it costs more in the long run. JMO M

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    gn7
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    Quote Originally Posted by ol guy View Post
    To many things wrong in that shot? Unless its an early tall block? Even so GN is right to advise spend a few more bucks and replace the set. You get what you pay for and if you don't it costs more in the long run. JMO M
    Thats the first thing that went through my head. But a tall deck 427 piston has a pin height of over 2.00. That piston isn't quite that tall. But the deck sure says something like motorhome, schoolbus, med duty truck low deck 427.



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    I am about to pull pistons on a 454 that i just got with a crank problem .Pistons have a center depression, 2 valve reliefs and number Z-8 188D 60 over. Could nt find part number either. Who knows?

  14. #12
    gn7
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    Zollner piston OEM supplier to GM
    Closed shop in 2009.
    LINK: Zollner plant closure

    Yours have 2 notches which makes sense. Lilflattie do not. Never seen a BBC piston with out notches for the intake. Has to be a super low performance, low lift, short duration camshaft

    LINK: Zollner piston listings



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    I was going to say it may be a 454 truck piston,, but all the factory tall deck pistons I have seen have 4 rings. If you invert the 8818 to 8188, the number does coincide with the Zollner "Z8188DS060 Zollner 01" "Chevrolet truck 454 V8 74-89, .080 cup",, which makes sense with the .080" cup. The photo shows a single shallow valve relief that could work with a "truck" type low rpm cam. I have pulled apart engines that had similar flat tops, but with dual opposing valve reliefs.

  16. #14
    gn7
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    Put the bottle down Barry. first there are no TALL deck truck 454s Any truck 454 is a low deck.
    small piece of trivia: The Detroit Pistons were originally the Fort Wayne Indiana, Zollner Pistons

    This is what I would have expected them to look like:


    This is the piston right here:




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    Last edited by gn7; 07-06-2011 at 10:56 PM.

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