Engines and Components› Engines, Blocks and Components

BLUEPRINT ENGINES

GM LS MOTORSPORTS 427 C.I. SHORT BL

$8,347.23

SKU: B05J BPMS4271SBLS

In Stock
In Stock
Ships by Jun 10
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Blueprint Engines High Strength Cast Iron Block is manufactured and machined in the USA. It features a 4.125" bore, 4-bolt main, and 1-piece rear main seal. The rotating assembly includes a forged steel crankshaft with a 4.000" stroke, forged 6.000" connecting rods, and forged pistons, internally balanced front and rear. It is equipped with BluePrint Engines Aluminum Cylinder Heads (64cc chamber, 2.08" intake / 1.60" exhaust valves, 220cc intake / 67cc exhaust runners).

Fitment

Fitment Guaranteed

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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

BrandBLUEPRINT ENGINES
Part NumberB05J BPMS4271SBLS

Videos

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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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