Engines and Components› Engine Bearings

Milodon

4-Bolt Ductile Iron Main Cap Set Pontiac 421-455

$469.95

SKU: M01Q 11500

In Stock
In Stock
Ships by Jun 9
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Milodon aftermarket main bearing caps strengthen factory 2-bolt blocks and add strength to 4-bolt blocks. Made from precision-machined, high-strength ductile iron, they feature angled side bolts that pull from the side walls of the block, preventing cap walk. The kit includes necessary bolts, washers, and drill bushing for installation.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandMilodon
Part NumberM01Q 11500

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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