Engines and Components› Engines, Blocks and Components

Smeding Performance

383 Extreme Stroker Engine

$8,100.00

SKU: 383EXT450

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In Stock
Ships by Aug 5
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Description

The Smeding Performance 383 Extreme is a crate engine engineered to provide big-block power in a small-block Chevy package. It is constructed using a heavy-duty 4-bolt main block with a 9.025" deck height and a 1-piece rear main seal. Internals consist of a forged 4340 steel crankshaft with a 3.800" stroke, 5140 forged steel I-beam rods, and custom dish-style hypereutectic aluminum pistons resulting in a 9.8:1 compression ratio. Performance is optimized by Smeding aluminum cylinder heads with 180cc intake ports and 2.02"/1.60" valves, paired with a hydraulic roller camshaft featuring .510"/.521" lift and 231°/236° duration. The setup is topped with a mid-rise air-gap dual-plane intake and full-roller 1.5 ratio rocker arms. Proper operation of this engine requires a torque converter with a 2,400-2,800rpm stall speed. It is backed by a 3-year, unlimited-mile warranty for added peace of mind.

MIA's Description

The Smeding Performance 383 Extreme is a high-performance small-block Chevy stroker engine designed for both street driving and high-output use. It features a heavy-duty 4-bolt main block, forged steel internals, and aluminum cylinder heads to provide reliable power.

The engine delivers a broad torque curve and includes a hydraulic roller camshaft, contributing to its signature exhaust tone. It is fully compatible with common street upgrades like power brakes and overdrive automatic transmissions.

Fitment

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Specifications

BrandSmeding Performance
Part Number383EXT450
CategoryEngines and Components

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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