Engines and Components› Engines, Blocks and Components

SEALED POWER

MSTR ECN W/O RODS & MAINS

$670.43

SKU: S03T 505-153J

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

BBC CHEVY 496-505 ENGINE, DART BIG M BLOCK, CRATE MOTOR 674 hp BASE ENGINE. This indicates a high-performance, large-displacement Chevrolet Big Block engine. It features a Dart Big M Block, which is an aftermarket performance block, and is rated at 674 horsepower. The "BASE ENGINE" suggests it might not include all accessories or a complete "turn-key" package.

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

BrandSEALED POWER
Part NumberS03T 505-153J

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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