BluePrint Engines GM Big Block Compatible Bare Engine Blocks

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When you're building big power, you need a block that's ready to carry the load—and the BluePrint Engines GM Big Block Compatible Bare Engine Blocks are engineered

When you're building big power, you need a block that's ready to carry the load—and the BluePrint Engines GM Big Block Compatible Bare Engine Blocks are engineered to take you all the way to a massive 598 cubic inches. Designed for serious street, strip, and marine performance, they deliver the strength, rigidity, and machining precision needed for high-horsepower combinations. Thick cylinder walls, robust main webbing, and smartly engineered oiling and cooling pathways give builders the confidence to push displacement and power further without sacrificing reliability. Whether you're crafting a torque-heavy cruiser or a high-rpm bruiser, the BluePrint Engines GM Big Block Compatible Bare Engine Blocks are a rock-solid starting point your big-inch Chevy build.

Key technical specifications:

* High-strength cast iron (EN-GJL-250)
* Main caps: 4-bolt splayed (Ductile iron or Billet steel options)
* Deck Heights: 9.800-inch or 10.200-inch
* Bore Sizes: 4.500-inch or 4.600-inch (Siamese bores)
* Rear Main Seal: 2-piece
* Max Displacement: capable of up to 632+ cubic inches
* Max Stroke: 4.750-inches
* Weight: approximately 240-260 lbs. (with caps)
* Features: Priority main oiling, extended cylinder skirts for stroker clearance, and .310 inches nominal wall thickness at max bore

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