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Thread: Pistons for a 7.4
          
   
   

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  1. 06-20-2015 07:57 AM #1
    RDP3430
    RDP3430 is offline CHR Junior sMember
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    Pistons for a 7.4

     



    Picked up a 7.4 Gen 6. The pistons have the following markings inside: GM, 1255 5797, 8224. Question is are they std size pistons ??? (I assume they are....want to verify)

    I did a google on the part number....nothing.

    Thanks,

    Rick
    Last edited by RDP3430; 06-20-2015 at 08:44 AM.
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  3. 06-20-2015 09:11 AM #2
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    techinspector1
    techinspector1 is offline CHR Member
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    Measure the skirt diameter opposite the pin bore with a 4" to 5" micrometer or 6" caliper. Standard would be 4.250". +0.030" would be 4.280".

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  4. 06-20-2015 09:17 AM #3
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    jerry clayton
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    besides measuring-oversize pistons are usually stamped on the tops
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