Product Summary

377, 400, Flat Top w/ 2 valve reliefs Piston Style

    Key Specs

    MFG. Part #
    BrandKeith Black

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    These Keith Black Claimer pistons (also known as economy pistons) feature coated skirts, wrist pin lockrings and T-5 hypereutectic construction. Can be used with either press fit or floating wrist pins (wrist pin and lockrings included).

    Set of 8 for Chevy 377 c.i. (4.125" bore x 3.48" stroke x 5.7" rod) and Chevy 400 c.i. (4.125" bore x 3.75" stroke x 5.565"). Does not include piston ring set. Use 5/64", 5/64", 3/16" piston rings (Ring Style A).

    Item Details

    (377) C/R 64cc=10.9, 76cc=9.6
    (400) C/R 58cc=12.6, 64cc=11.7, 76cc=10.3
    Piston/Pin Weight: 630 g
    Rod Length: 5.7(377), 5.565(400)



    • Comp Height 5.565" Rod -  1.565
    • Comp Height 5.7" Rod -  1.433
    • Pin Diameter -  0.9272

    CARB Warning

    For race/ off road use or for use on pre-1966 vehicles.

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.


    MFG. Part #
    BrandKeith Black
    Piston StyleFlat Top w/ 2 valve reliefs
    Piston MaterialHypereutectic Aluminum
    Piston Diameter
    Connecting Rod Length5.700"
    Piston Weight630 grams
    Piston Ring StyleA
    Wrist Pin Diameter0.9272"
    Compression 58cc =12.6 : 1
    Compression 64cc =10.9 : 1
    Compression 76cc =9.6 : 1
    GTIN Code
    Sold in QuantitySet