NRE Naturally Aspirated 632 BBC – Hot Rod Series | 850 HP Turn-Key Big Block

The NRE Naturally Aspirated 632 BBC Hot Rod Series is built for enthusiasts who demand raw, old-school big-block power with modern reliability. Producing over 850 horsepower, this engine delivers explosive throttle response and massive torque across the RPM range while maintaining true street usability. It runs comfortably on 91-octane pump gas, making it a brutal yet practical solution for hot rods, muscle cars, and aggressive street builds.

This is a complete, turn-key engine designed as a long-term workhorse. The custom NRE hydraulic roller camshaft provides that classic nasty hot rod idle while minimizing maintenance, and each engine is fully broken-in and dyno tuned before delivery to ensure flawless performance from day one. If you’re looking for an engine that sounds angry, pulls hard everywhere, and can still be driven regularly, this 632 BBC delivers exactly that.

Performance & Driving Experience

The Naturally Aspirated 632 excels in instant throttle response and relentless torque without the complexity of power adders. The combination of large displacement, CNC-ported cylinder heads, and a carefully matched induction system results in strong low-end power and aggressive top-end pull. The hydraulic roller valvetrain offers excellent durability and reliability, making this engine suitable for extended street use while still delivering track-ready performance.

Engine Block & Rotating Assembly

Block

• Dart Big Block Chevy

• 4.500″ bore

• Splayed main caps

• 1-piece rear main seal

Rotating Assembly

• Callies Magnum 4.5″ stroke 4340 forged crankshaft

• Callies 4340 forged H-beam connecting rods, 6.7″

• JE forged pistons, 10:1 compression

• Plasma moly piston rings

This premium forged assembly ensures exceptional strength, smooth operation, and durability under high horsepower and torque loads.

Valvetrain & Timing Components

• Custom NRE hydraulic roller camshaft

• Hydraulic short-travel roller lifters

• T&D shaft rocker system

• Trend pushrods

• Cloyes timing chain

• Cast aluminum Milodon timing cover

The hydraulic roller setup delivers aggressive cam profiles with reduced wear and minimal maintenance.

Cylinder Heads, Induction & Fuel System

Cylinder Heads

• Brodix 380 CNC aluminum cylinder heads

• 2.300″ intake / 1.880″ exhaust Inconel valves

• PAC performance valve springs

Induction System

• Brodix single-plane intake manifold

Fuel & Ignition

• 1050 CFM Holley Dominator carburetor

• MSD Pro Billet ignition system

This combination provides excellent airflow, crisp throttle response, and consistent fueling across the RPM range.

Oil System, Hardware & Finishing Details

• Moroso oil pan with high-volume oil pump and pickup

• ATI harmonic damper

• Fel-Pro head gaskets

• ARP fasteners throughout

• NRE billet fully CNC-machined valve covers

Exhaust: Headers shown in photos are not included in pricing.

Specifications

• Engine Type: Big Block Chevy

• Displacement: 632 cubic inches

• Horsepower: 850+ hp

• Fuel Requirement: 91-octane pump gas

• Induction: Naturally aspirated, carbureted

• Camshaft: Hydraulic roller

• Compression Ratio: 10:1

• Usage: Street, hot rod, muscle car, performance builds

• Build Status: Fully assembled, broken-in, and dyno tuned