Compression Ratio: 9.5:1 with 70cc Chamber - LSX Style 6 Bolt Studded Heads
Piston: Mahle 2618 Custom Forged
Crankshaft: 8 Counterweight Forged Crank - 4.125" Stroke and 6.125" Rods
This engine Does NOT come with a Fuel Injection ECU and Wiring Harness.
Requires Race Fuel of 100+ Octane
- Description
- Engine Specs
- Warranty
**BluePrint Motorsports engines are built for maximum performance and are intended for extreme duty race applications. If this engine is used in a street application our normal 30 month, 50,000-mile warranty applies, if used in sanctioned racing no warranty, expressed, or implied.
Overview:
The new BPE LS Iron Block 427 Stroker Short Block is built as a strong foundation for high-horsepower power adder applications. Featuring a durable iron LS block and a fully forged rotating assembly, this short block is designed to handle supercharged, turbocharged, or nitrous combinations with confidence. It includes forged pistons with a 4.070 bore, forged H-beam rods, and an 8-weight forged crankshaft with a 58x reluctor ring, all internally balanced for smooth and reliable performance. Finished with a 6-bolt crank flange for added strength, this 427 LS short block is an excellent choice for serious street or race builds looking for durability and big power capability.
Description:
- Compression Ratio: 9.5:1
- BluePrint Engines Forged Crankshaft
- Mahle 2618 Custom Forged Pistons
Block:
- BluePrint Engines High Strength Cast Iron (LSX Style) Block
- Increased Deck Thickness and Strength Webbing
- Utilizes OEM LS3 Front and Rear Covers
- Improved Water Jacket Design
- Extended Cylinder Skirt
- 1-piece Rear Main Seal
- Priority Main Oiling
- 4.0695" Bore
- 6-bolt studded mains
- Billet Main Caps
Rotating Assembly:
- Forged 8cwt Crankshaft
- 4.125" Stroke
- Forged H-Beam 6.125" Connecting Rods
- Mahle Custom 2618 Forged Pistons - Dish - 22cc
- Internally Balanced Front and Rear
Notes:
- BluePrint Motorsports engines are built for maximum performance and are intended for extreme duty applications. Because of the high-stress nature of their use, these engines are sold without any warranty, expressed, or implied.
Blocks
- BluePrint Engines High Strength Cast Iron (LSX Style) Block
- Increased Deck Thickness and Strength Webbing
- Utilizes OEM LS3 Front and Rear Covers
- Improved Water Jacket Design
- Extended Cylinder Skirt
- 1-piece Rear Main Seal
- Priority Main Oiling
- 4.0695" Bore
- 6-bolt studded mains
- Billet Main Caps
Firing Order
1,8,7,2,6,5,4,3
Rotating Assembly
- Forged 8cwt Crankshaft
- 4.125" Stroke
- Forged H-Beam 6.125" Connecting Rods
- Mahle Custom 2618 Forged Pistons - Dish - 22cc
- Internally Balanced Front and Rear
Notes
- BluePrint Motorsports engines are built for maximum performance and are intended for extreme duty applications. Because of the high-stress nature of their use, these engines are sold without any warranty, expressed, or implied.
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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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.