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- Description
- Warranty
If you’re aiming to build a stout, reliable small block without breaking into exotic territory, this SBC-compatible block is the perfect foundation. Engineered to comfortably support combinations all the way up to 454 cubic inches, it delivers the strength, precision, and durability builders demand. With thick cylinder walls, a rigid casting, and smart machining allowances, this block is built to handle everything from a crisp street cruiser to a hard-hitting weekend track car.
- Cylinder Bore (Rough): 4.120" to 4.122"
- Cylinder Bore (Max): 4.250"
- Cam Bearings: Durabond GMP-8
- Cam Bearing Bore ID: 2.000"+/- .001"
- Camshaft Position: OEM
- Cam Drive / Timing Set: OEM equivalent
- Cam Retaining Plate: OEM
- Cubic Inch (Max): 454
- Cylinder Wall Thickness: .230" Nominal @ Max Bore
- Water Jacket Style: Siamese
- Cylinder Skirt Length: 5.800" Nominal
- Deck Height: 9.025" +.005" / -.000"
- Deck Thickness: .600" Nominal
- Freeze / Core Plugs: 1-5/8" x 10
- Head Bolt / Stud Threads: 7/16-14 UNC
- Lifter Bores: .8437" +/- .0003"
- Lifter Retainer (If not using tie car lifters): OEM W/Roller Provisions
- Main Bearing Bore (Line Honed): 400 Main - 2.8400" - 2.8405"
- Main Bearing Caps: Ductile Cast Iron 4-Bolt Splayed
- Main Cap Bolts: 7/16-14 Inner / 3/8-16 Splayed
- Main Fastener Tensile Strength: 180,000 to 210,000 PSI
- P1 Main Stud Kit P/N: TBD
- ARP Main Stud Kit P/N: TBD
- Material (Block): EN-GJL-250 Iron
- Oil System: Priority Main
- Oil Pump: OEM
- Oil Filter: OEM
- Oil Pan: OEM
- Rear Main Seal: 2 piece
- Starter: OEM
- Stroke (Max): Cast in clearance 3.875"
- Timing Cover: OEM
- Approx. Weight with Main Caps:170-190lbs
Better Than the Rest.
The satisfaction of our customers is our highest priority at BluePrint Engines. Every engine we build is assembled with premium components, balanced to within two grams, and dyno-tested to verify real horsepower and torque before it leaves our facility.
All BluePrint products include warranty protection designed specifically for how they're used. Our complete crate engines carry our industry-leading 30-month / 50,000-mile warranty, offering the confidence and peace of mind serious builders expect. Other BluePrint products—including bare blocks, marine engines, transmissions, race applications, and cylinder heads—feature warranty coverage tailored to their intended use and operating conditions.
For full terms and specific coverage by product category, download our warranty guide below. It contains complete details, limitations, and instructions for warranty registration and claims.
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Protect your investment by registering your warranty today. Register below to ensure coverage and stay up to date on important service information.
Register NowEVERY BLUEPRINT ENGINE ACES THE DYNO TEST
We make sure we hit our target horsepower and proper torque with every crate engine. We use an advanced computerized balancer in our in-house dyno testing rooms to get our rotating assemblies within two grams, ensuring silky smooth power over the entire RPM range. That’s precisely why our engines sound and run better than our competitors.
All specs, zero speculation: A comprehensive, dyno-generated printout showing your critical engine specs will accompany your delivered engine — every time. No more guessing or wondering what your installed engine’s real-world peak horsepower and torque ratings actually are. Any doubters in the crowd? Simply flash ‘em your exact engine’s dyno results.