Spool Honda K20 X300 Extreme 300M Conrods with ARP 3/8 Bolts
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Spool X300 Extreme 300M I-Beam Conrods for Honda K20
The Spool X300 Extreme series represents the next generation of high-performance connecting rod technology, building on the proven success of the Spool Drag Pro range to deliver exceptional strength, durability and reliability for serious Honda K-Series builds.
Manufactured from premium aerospace-grade 300M alloy steel and fitted with genuine ARP 2000 3/8" fasteners as standard, the X300 has been engineered to withstand extreme cylinder pressures and high-RPM operation, making it the ideal choice for naturally aspirated and turbocharged K20 engines producing 1,000 horsepower and beyond.
Designed as a direct-fit upgrade for Honda K20 engines, the X300 combines increased beam strength, reinforced pin-end design and enhanced fastener retention to provide exceptional durability in demanding street, drag racing and circuit racing applications.
Specifications
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Application: Honda K20 Engines
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Suitable for Naturally Aspirated and Turbocharged K20 combinations
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I-Beam design
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Premium 300M alloy steel construction
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Genuine ARP 2000 3/8" fasteners included as standard
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ARP L19 and CA625+ fastener upgrades available
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Weight: 487g with bolts
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Side oil squirters
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Direct-fit design with no machining required
Key Improvements
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Increased beam strength for high horsepower applications
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Reinforced fastener area for improved cap retention under extreme cylinder pressure
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Increased strength around the gudgeon pin area
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Optimised for high-RPM and high-boost engine combinations
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Designed to support 1,000+ horsepower builds
Features
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Aerospace-grade 300M forged steel construction
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Two-piece precision forging design
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Dowelled caps for precise cap alignment and improved bearing housing integrity
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X-ray and sonic tested for material consistency
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Vacuum degassed material to remove impurities
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Quenched and heat treated for maximum strength and durability
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Shot peened for improved fatigue resistance
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100% Magnaflux inspected
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Weight matched sets to within ±1 gram
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Side oil squirters for enhanced lubrication
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Designed to withstand extreme boost, RPM and cylinder pressure
Honda's K20 engine platform has become a benchmark for high-performance four-cylinder builds worldwide. The Spool X300 Extreme 300M Conrod is designed to provide the strength and reliability required to take these engines to the next level, whether you're building a competitive drag car, time attack car, circuit racer or high-powered street machine.
Note: Bearings are not included.
| Product Name | Spool Honda K20 X300 Extreme 300M Conrods with ARP 3/8 Bolts |
|---|---|
| Brands | Spool |
| Engine | K20 |
| Make | Honda |
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
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If you are unsure, get in touch by emailing [email protected], messaging us on Facebook, or phoning us at +61 7 5645 1333 (8am to 2pm AET).
What bolts do these conrods use and how should I tighten them?
These rods use ARP conrod bolts, usually ARP2000 as standard with L19 or CA625+ available on some models. ARP2000 bolts are generally torqued to around 55 ft-lb for 3/8 inch and around 75 ft-lb for 3/8 inch when using ARP Ultra-Torque lube. L19 and CA625+ bolts must be tightened by stretch, not torque. Always refer to the latest ARP instructions for exact specifications.
Do these conrods have a horsepower rating or warranty?
No. Like other performance rods, they do not carry a horsepower or performance warranty. Spool warrants workmanship before installation, but once fitted, power handling depends entirely on machining, clearances, tuning, fuel, boost level and rpm.
Do the big end and small end need machining?
They often do. Crank journals and pin bores vary between engines, so your builder should measure the big end oil clearance and small end pin clearance and hone as required before assembly.
What is the weight of the Spool K20 X300 conrods?
The Spool K20 X300 conrods weigh 487 grams each, including the bolts.
What material are the Spool K20 X300 conrods made from?
These conrods are made from high tensile 300M forged steel, providing exceptional strength and durability for high-performance applications.
Do I need to perform any machining on the Spool K20 X300 conrods?
No machining is required for these conrods; they are designed as a direct fit for K20 NA and K20 Turbo applications. For high performance applications, it is essential that bearings clearances are checked and set based on the planned horsepower. This may result in the conrod big end requiring honing.
What testing and treatments do the Spool K20 X300 conrods undergo?
The conrods are X-RAY and Sonic tested, quenching and heat treated, shot peened, and 100% Magnafluxed to ensure quality and reliability.
