BluePrint Engines BF427K4R7C SBF 427/4R70W Carbureted, Pol. Cobra

This high-output 427 c.i. Small Block Ford–compatible BluePrint Engine delivers 541 horsepower and 519 lb-ft of torque, making it an excellent choice for aggressive street builds, restomods, and performance enthusiasts seeking a reliable powerplant with serious horsepower and torque. Built around a 9.5-inch deck height Windsor-based BluePrint high-strength cast iron block featuring a 4.125-inch bore, 4-bolt main caps, one-piece rear main seal, and a forged rotating assembly. It is topped with CNC-ported BluePrint Engines aluminum cylinder heads and a matched hydraulic roller camshaft, providing exceptional airflow and a broad, responsive powerband. With a 10.0:1 compression ratio, this engine is optimized for 91+ octane pump gas, delivering impressive performance without sacrificing drivability. Backed by BluePrint Engines’ industry-leading 30-month / 50,000-mile warranty.

The 427ci Small Block Ford achieved modern legend status through its use in the industry’s top Cobra and Cobra replica builders where it became known for producing massive power in lightweight chassis. These engines helped redefine the capabilities of the Windsor-based platform, particularly in high-end Cobra replicas and continuation-style builds. Weighing significantly less than a traditional big block, the 427 stroker enhances front-end balance, handling, and braking, making it a proven choice for performance-focused applications.

• BluePrint 427 delivers 541 horsepower and 519 ft.-lbs. of torque for serious small block Ford performance
• Cobra-style valve covers and polished front accessory drive
• Holley 870 CFM carburetor
• Forged crankshaft, forged pistons, aluminum heads, and hydraulic roller cam 
• Complete 4R70W automatic transmission package includes controller, torque converter, lockup overdrive, flexplate, and starter

Block:

• NEW BluePrint Engines' High Strength Cast Iron Block
• 4-Bolt Main
• 4.125" Bore
• 1-Piece Rear Main Seal
• 9.500 Deck Height

Rotating Assembly:

• New Forged Crankshaft
• 4.000" Stroke
• Forged 6.250" Connecting Rods
• Forged Pistons
• Internally Balanced

Cylinder Heads:

• Aluminum Cylinder Heads 
• 60cc Chamber
• 2.02" Intake / 1.60" Exhaust Valves
• 205cc Intake / 70cc Exhaust Runners

Cam Specs:

• Cam Type: Roller
• .608 Intake / .608 Exhaust Lift
• 248 Intake / 258 Exhaust Duration
• @.050-114 Degree Lobe Separation

Also Includes:

• Ribbed 427 Cobra Aluminum Valve Covers
• Holley 870 cfm Carburetor
• Harmonic Balancer
• Spark Plugs & Wires
• Plug Wire Separators
• Timing Cover
• Powder Coated 9qt. Oil Pan
• Thermostat and Thermostat Housing
• Oil Filter
• Fuel Pump
• Polished Front Accessory Drive - BPP302FDACPS4
• Driver Side Standard Rotation Water Pump
• Type II Power Steering Pump
• Remote Power Steering Pump Reservoir
• 140amp 1-wire Alternator
• 7B10 Peanut Air Conditioning Compressor

Assembled with Complete 4R70W Automatic Transmission Package:

• Includes Electronic Transmission Controller
• Transmission built to 650 HP
• 2200-2600 Stall Torque Converter
• Flex plate
• Starter
• 4 Speed, Overdrive transmission w/Lockup
• GEAR RATIOS

First: 2.84 :1.

Second: 1.55 :1.

Third: 1.00 :1.

Overdrive: 0.70 :1.

Reverse: 2.32 :1.