Hawks Motorsports offers the BluePrint Engines G4548995 GM Big Block Compatible 454 C.I. Long Block, a 50-state legal OEM-spec replacement engine engineered for select 1989-1995 GM Big Block Chevrolet applications. Built to factory specifications using premium components, precision machining, and tighter balancing tolerances, this engine delivers dependable OEM performance while meeting emissions requirements for use in all 50 states. It is the ideal replacement for worn or failed original 454 engines in GM trucks and SUVs.

The G4548995 is assembled using a BluePrint high-strength cast iron 454 block featuring a 4.250-inch bore, 4.000-inch stroke cast crankshaft, OEM-style 6.135-inch connecting rods with 150,000 PSI rod bolts, and OEM-spec hypereutectic pistons. Cast iron cylinder heads and an OEM-spec hydraulic flat tappet camshaft provide factory-equivalent performance while maintaining compatibility with the original intake manifold, fuel injection system, exhaust manifolds, ignition, and engine management system. Horsepower and torque remain at OEM specifications, making this engine perfect for emissions-compliant restorations and factory replacement applications.

The long block arrives assembled with the timing cover, harmonic balancer, valve covers, oil pan, and dipstick installed. Customers simply transfer their existing intake manifold, fuel injection components, exhaust manifolds, distributor, accessories, and engine electronics where applicable. Every BluePrint engine is dyno tested prior to shipment and backed by an industry-leading 30-Month / 50,000-Mile Warranty.

Key Features:

• SKU: G4548995
• GM Big Block Compatible 454 C.I. Long Block
• 50-State Legal OEM replacement engine
• Designed for select 1989-1995 GM applications
• OEM horsepower and torque output
• BluePrint high-strength cast iron block
• Cast iron cylinder heads
• 4-bolt main block
• 4.250" bore
• 4.000" stroke
• Cast crankshaft
• OEM-style 6.135" connecting rods
• 150,000 PSI rod bolts
• OEM-spec hypereutectic pistons
• OEM hydraulic flat tappet camshaft
• Camshaft Specs:
  • .409" Intake Lift
  • .442" Exhaust Lift
  • 193° Intake Duration @ .050"
  • 203° Exhaust Duration @ .050"
• 1-piece rear main seal
• Mechanical fuel pump provision
• External engine balance
• Harmonic balancer installed
• Oil pan installed (rear sump)
• Timing cover installed
• Valve covers installed
• Dipstick installed
• Manufactured and machined in the USA
• Dyno tested
• 30-Month / 50,000-Mile Warranty

Fitment Applications:

Designed as a factory replacement for select 1989-1995 GM Big Block Chevrolet vehicles originally equipped with a 454 C.I. engine, including:

• 1991-1993 Chevrolet C/K 1500 454SS
• 1991-1995 Chevrolet C/K 2500
• 1991-1995 Chevrolet C/K 3500
• GMC C/K 2500
• GMC C/K 3500
• Chevrolet Suburban 2500
• GMC Suburban 2500
• Chevrolet P-Series chassis
• Additional GM vehicles originally equipped with the Gen V 454

Verify your application using the BluePrint fitment guide before ordering.

Installation Notes:

• Long block assembly only.
• Reuse OEM intake manifold.
• Reuse OEM fuel injection system.
• Reuse OEM exhaust manifolds.
• Reuse OEM distributor and ignition components.
• Water pump not included.
• Front accessory drive not included.
• This engine features a 1-piece rear main seal.
• Recommended harmonic balancer: BluePrint BPP454E
• Requires a 42.5 oz externally balanced flywheel or flexplate.
• Ignition timing is controlled by the OEM ECU.
• Recommended fuel: 87 octane or higher.