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Dart

BBC IR/BLK 10.400STD4.250 +.400 RC

$5,099.99

SKU: D00Q 31213395

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Special Order
Ships in 4–6 weeks
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$100 Minimum Order
Non-Returnable Item
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Overview

Dart engineered the Big M2 to be the strongest, most reliable, and easiest to build big block on the market. It features a 10.400” deck height, 4.250” bore (max bore 4.625”), siamesed extra thick cylinder walls, +.300” tall Gen VI style lifters, 4-bolt billet main bearing caps with splayed outer bolts, true priority main oil system with a stepped main oil gallery (9/16“ to 1/2“ to 7/16“) and front oil crossover, lifter valley head stud bosses, oil gallery holes machined for o-ring plugs, +.400" raised cam, dual oil pan bolt patterns, and is made from 220 BHN Cast iron. A parts kit (PN 32000037) is included.
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BBC IR/BLK 10.400STD4.250 +.400 RC

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandDart
Part NumberD00Q 31213395

Videos

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Returns & Fitment

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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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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