Hawks Motorsports offers the BluePrint Engines B598KB4L8 GM Big Block Compatible 598 C.I. Builder Series Engine and 4L80E Automatic Transmission Package, combining massive big block horsepower with modern overdrive cruising capability. Producing 741 horsepower and 703 lb-ft of torque, this complete carbureted drivetrain package is designed for enthusiasts looking for a powerful, reliable, and installation-ready combination for street performance, Pro Touring, classic muscle, and custom builds.

The 598 C.I. Builder Series big block features a high-strength cast iron block, BluePrint aluminum cylinder heads, hydraulic roller camshaft, forged crankshaft, forged pistons, and forged connecting rods designed to handle serious horsepower and torque. The large-displacement combination of a 4.600" bore and 4.500" stroke forged crankshaft delivers the low-end torque and aggressive performance expected from a high-performance big block Chevrolet-style engine.

This Standard Edition Builder Series package includes a complete 4L80E automatic transmission, electronic transmission controller, lockup capability, high-stall torque converter, starter, and flexplate. The black pulley kit provides a clean, aggressive engine bay appearance while including the necessary accessory drive components for a complete installation.

The B598KB4L8 is an ideal choice for builders wanting old-school big block power with modern drivetrain convenience. Whether installed in a classic Camaro, Chevelle, truck, street rod, or custom performance vehicle, this package delivers the horsepower, torque, and reliability needed for serious street and strip applications.

Key Features:

• SKU: B598KB4L8
• GM Big Block Compatible 598 C.I. Engine Package
• Complete Engine & 4L80E Automatic Transmission Combo
• 741 Horsepower
• 703 lb-ft Torque
• Standard Edition Builder Series
• Carbureted configuration
• Black pulley/accessory kit
• High-strength cast iron block
• Manufactured and machined in the USA
• Standard deck block
• 4-bolt main design
• 1-piece rear main seal
• Mechanical fuel pump provision
• 4.600" Bore
• 4.500" Stroke
• Forged crankshaft
• Forged pistons
• Forged 6.480" connecting rods
• Internally balanced rotating assembly
• 10.5:1 Compression Ratio
• BluePrint aluminum cylinder heads
• Hydraulic roller camshaft
• Holley 1250 CFM carburetor
• Electric fuel pump
• Aluminum intake manifold
• Ready-to-Run distributor
• Harmonic balancer included
• Timing cover installed
• Valve covers installed
• Oil pan installed
• Oil pump installed
• Spark plugs included
• Spark plug wires included
• Thermostat and housing included

Black Pulley Kit Includes:

• Reverse rotation short water pump
• 140-amp one-wire alternator
• Peanut-style A/C compressor
• Type II power steering pump with remote reservoir

Transmission Package Includes:

• Complete 4L80E automatic transmission
• Electronic transmission controller
• Lockup capability
• 3800+ stall torque converter
• Flexplate
• Starter
• Gear Ratios:
  • 1st: 2.482
  • 2nd: 1.482
  • 3rd: 1.000
  • 4th: 0.750
  • Reverse: 2.077

Fitment Applications:

Designed for custom GM Big Block compatible applications:

• Chevrolet Camaro
• Chevrolet Chevelle
• Chevrolet Nova
• Chevrolet Corvette
• Chevrolet El Camino
• Chevrolet Impala
• Chevrolet C10 / C20 / C30 Trucks
• Street rods
• Restomod builds
• Pro Touring vehicles
• Classic muscle cars
• Custom hot rods
• Street/strip applications

Verify engine bay clearance, transmission tunnel clearance, driveshaft length, crossmember requirements, cooling system capacity, and accessory clearance before installation.

Installation Notes:

• Complete engine and transmission package.
• Carbureted fuel system required.
• Requires compatible fuel pump and fuel lines.
• 4L80E transmission requires electronic controller installation.
• Includes high-stall torque converter for performance applications.
• Requires compatible driveshaft and transmission crossmember.
• Verify accessory clearance before installation.
• Black front accessory drive is low-profile but additional hose routing, wiring, or fabrication may be required depending on vehicle application.
• Recommended fuel: 91+ octane
• Professional installation and tuning recommended.