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    Main Caps, Angled, Pontiac 421/428/455, Milodon

    Vehicle Specific fits 6 models
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    Part# G240066
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    Limited Supply (Discontinued).

    Main Caps, Angled, Pontiac 421/428/455, Milodon

    These main caps, whether they be for 2-bolt to 4-bolt conversion, or you're replacing the factory straight 4-bolt caps with the Milodon straight, or angled 4-bolt caps, you're increasing the strength of the block. Because the angled main caps place the side loading to the outside of the block, the caps are located against the main cap register in the block preventing cap "walk". Milodon main caps have more cross-sectional strength due to the high-strength ductile material and yet they aren't so rigid that they transfer shock loads to the crank and bearings. The center three main cap kits come with all the bolts, washers and drill bushings needed. Block machining is required for final installation.


    • NOTE: These high-performance items are not eligible for any further discounts or promotional pricing.
    WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

    Vehicle Fitment

    Make & Model Year Range Application Details
    Pontiac Bonneville 62-76 421/428/455, angled
    Pontiac Catalina 62-76 421/428/455, angled
    Pontiac Grand Prix 62-76 421/428/455, angled
    Pontiac GTO 63-73 421/428/455 – angled
    Pontiac LeMans 63-73 421/428/455 – angled
    Pontiac Tempest 63-73 421/428/455 – angled
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    Main Caps, Angled, Pontiac 421/428/455, Milodon
    Milodon Main Caps, Angled, Pontiac 421/428/455, Milodon