Katech Street Attack Gen V LT1 427 CID Engine

Katech Street Attack Gen V LT1 427 CID Engine

Sleeved LT1 Foundation with a Forged Rotating Assembly and Katech CNC Ported Cylinder Heads.

The Katech Street Attack Gen V LT1 427 CID Engine combines a Katech sleeved LT1 block with a Callies forged crankshaft, Callies forged H-beam connecting rods, and Mahle pistons, pins, and rings. Katech piston squirters and a Katech HCS/HCP oil pump are included.

Katech CNC ported cylinder heads feature a competition valve job and hand blending, paired with a Katech 427 LT1 camshaft and validated valvetrain. An MSD intake manifold, Katech 103mm throttle body, and Katech C5-R timing chain complete the listed combination. Dyno break-in and power validation are included.

Built to Order: Contact Katech Sales for the current estimated lead time.

Dyno-Validated Performance: 702 HP and 627 lb-ft of torque, based on corrected engine dyno results of 701.8 HP and 626.5 lb-ft.

Features & Benefits

• Katech Sleeved LT1 Block
• 427 CID Displacement
• Katech Piston Squirters
• Callies Forged Crankshaft
• Callies Forged H-Beam Connecting Rods
• Mahle Pistons, Pins, and Rings
• Katech HCS/HCP Oil Pump
• Katech CNC Ported Cylinder Heads
• Katech Competition Valve Job and Hand Blending
• Katech 427 LT1 Camshaft and Validated Valvetrain
• Katech C5-R Timing Chain
• MSD Intake Manifold
• Katech 103mm Throttle Body
• Dyno Break-In and Power Validation

Technical Specifications

• Engine Family: GM Gen V LT1
• Displacement: 427 CID
• Tested Peak Power: 701.8 HP, Corrected Engine Dyno
• Tested Peak Torque: 626.5 lb-ft, Corrected Engine Dyno
• Engine Block: Katech Sleeved LT1
• Rotating Assembly: Callies Forged Crankshaft and H-Beam Connecting Rods with Mahle Pistons, Pins, and Rings
• Oil Pump: Katech HCS/HCP
• Cylinder Heads: Katech CNC Ported with Competition Valve Job and Hand Blending
• Camshaft: Katech 427 LT1
• Intake Manifold: MSD
• Throttle Body: Katech 103mm
• Order Type: Built to Order

Dyno Note: Power and torque figures are from the supplied August 30, 2018 engine dyno sheet and represent the tested combination. Output varies with engine configuration, fuel, calibration, and test conditions.

Engine Package

The assembled engine includes the components listed above, along with dyno break-in and power validation. Confirm the complete supplied configuration and any additional components needed for your installation with Katech Sales before ordering.

Photo Note: The product photos show optional Katech valve covers and a dry sump system upgrade. These upgrades are not included in the base package. The alternator, tensioner, and A/C delete pulley shown were used for dyno testing and are not included.

Swap & Installation Compatibility

Intended for compatible Gen V LT1 installations and engine swaps. Installation requirements depend on the supplied oiling configuration, vehicle, and supporting systems. This listing does not establish direct fitment to a specific vehicle.

• Confirm Engine Mounting, Oiling Configuration, Oil Pan, and Chassis Clearance
• Match the Transmission, Flywheel or Flexplate, and Related Components
• Verify Intake, Exhaust, Cooling, and Accessory Drive Requirements
• Confirm Fuel System Capacity and Gen V Direct-Injection Compatibility
• Match the Engine Controls, Wiring, and Calibration to the Supplied Configuration

Lead Time & Freight Shipping

This engine is built to order and ships by freight only. Contact Katech Sales for an estimated production lead time and a shipping quote for your delivery location.

Why Choose Katech

The Katech Street Attack Gen V LT1 427 CID Engine combines a sleeved block and forged rotating assembly with Katech cylinder head machining, camshaft selection, and valvetrain validation. Included dyno break-in and power validation verify the assembled engine's performance before delivery.

For engine configuration, swap compatibility, lead time, and freight quotes, contact Katech Sales at 586-791-4120.