Spool LS Holden / GM LS 5.7 and 6 Litre V8 X300 Extreme 300M Conrods

Spool X300 Extreme 300M I-Beam Conrods for Holden / GM LS V8

The Spool X300 Extreme series represents the next evolution in high-performance connecting rod technology, building on the proven success of the Spool Drag Pro range to deliver exceptional strength, durability and reliability in the most demanding racing applications.

Manufactured from premium aerospace-grade 300M alloy steel and fitted with genuine ARP 2000 7/16" fasteners as standard, the X300 has been engineered for extreme horsepower engines producing 2,000hp and beyond.

Designed for serious drag racing, circuit racing and high-boost street applications, the X300 offers superior tensile strength, fatigue resistance and toughness compared to conventional 4340 connecting rods, making it the ideal choice for engine builders who demand the highest level of performance and reliability.

Specifications

• Centre-to-centre length: 6.125"

• Small end bore: 0.927"

• Bronze bushed small end

• I-Beam design

• Premium 300M alloy steel construction

• Genuine ARP 2000 7/16" fasteners included

• Suitable for Holden / GM LS V8 engines

Features

• Aerospace-grade 300M forged steel construction

• Two-piece precision forging design

• Dowelled caps for precise cap alignment and improved bearing housing integrity

• X-ray and sonic tested for material consistency

• Vacuum degassed material to eliminate impurities

• Quenched and heat treated for maximum strength and durability

• Shot peened to improve fatigue resistance

• 100% Magnaflux inspected

• Weight matched sets to within ±1 gram

• Designed for extreme cylinder pressures and high RPM operation

• Suitable for engines producing 2,000+ horsepower

Whether you're building a record-setting drag car, a high-boost street machine or a dedicated race engine, the Spool X300 Extreme 300M Conrod delivers the strength and reliability required for the most demanding applications.

Note: Bearings are not included.

Available options

• Conrod Bolt Option: ARP2000 7/16 Bolt; ARP L19 7/16 Bolt

Engine build fitment

LS 5.7L and 6.0L V8. Match the selected dimensions, engine generation and rotating assembly specification before machining or assembly.

Installation and BBT workshop support

Confirm centre-to-centre length, journal dimensions, pin diameter and bolt clearance. Use the fastener manufacturer’s instructions for lubricant, tightening and stretch measurements.

Built by Boost & Tune is an authorised Spool Imports dealer and can assist with component selection, engine assembly and tuning requirements for your build.