Honda K20 Complete High Compression Forged Bottom End Short Block

Bourne HPP Honda K20 High-Compression Forged Short Block

Build your engine on a foundation of motorsport excellence. The Bourne HPP K20 Short Block is a professional-grade, high-compression rotating assembly designed for those who demand uncompromising reliability and peak performance.

By marrying genuine Honda precision with world-class Wössner forged internals, we have created a bottom end capable of dominating the track while maintaining the refined harmonics the K-Series is famous for.

The Internal Powerhouse

• Wössner High-Compression Forged Pistons: Specifically engineered for the K20A2/Z4 platforms, these pistons are the choice of Europe’s leading engine builders.

  • Low-Friction Technology: Coated with Wössner’s unique Moly-based skirt lubricant to reduce drag and allow for tighter tolerances.

  • Advanced Metallurgy: Forged from 4032 T6 alloy, which minimizes thermal expansion and eliminates the "piston slap" common in lesser forged components.

  • Optimized Crowns: Polished to improve flame travel and resist carbon buildup and detonation.

• Bourne HPP Spec Wössner Connecting Rods:

  Crafted from high-tensile 4340 forged steel, these H-Beam rods provide a massive increase in strength over OEM units without any weight penalty.

  • Maximum Security: Equipped with ARP 2000 bolts as standard to ensure rod-bolt integrity at extreme RPM.

  • Shot-Peened: Stress-relieved for maximum fatigue life during endurance racing.

Master-Class Preparation

At Bourne HPP, every block undergoes a rigorous preparation phase before a single bolt is turned.

• Pristine Block Prep: We use a Genuine Honda K20 block that is blasted, de-burred, and meticulously checked for casting integrity and perfect bore geometry. To ensure a perfect ring seal and head gasket mating surface, every block is precision bored, honed to specific tolerances, and skimmed for absolute flatness.

• The "Balanced" Crank: We utilise a Genuine Honda Crankshaft that is precision balanced to ensure smooth power delivery all the way to a 9,000+ RPM redline. We also offer the service to use a customer supplied crankshaft which we will check, clean up and balance if required.

• Bespoke Bearing Fitment: Every build utilses Brand New Genuine Honda main Upper, Lower and rod bearings, individually measured and matched to the specific journals of your crankshaft for perfect oil film clearances.

• Total Reliability: We include brand-new Genuine Honda Squirter Jets, Bolts, and Thrust Washers to ensure your forged pistons stay cool and your crank stays centered under heavy lateral G-loads.

Technical Specifications

The Bourne HPP Advantage: This is a "drop-in" high-compression solution for serious K-Series enthusiasts. Whether you are aiming for a high-response 280+ bhp N/A build or a high-revving street beast, this bottom end offers the peace of mind that only professional motorsport assembly can provide.

Ready for your choice of cylinder head. Engineered to win.