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 A-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. (Please note: If you are supplying a Cylinder block, only a basic check will be carried out. For the full work as described please contact us.) 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 Component Specification Engine Block Genuine Honda K20 (Blasted, De-burred, Rebored and Honed) Pistons Wössner Forged High Comp (4032 T6 Alloy / Moly Coated) Connecting Rods Wössner A-Beam with ARP 2000 Bolts Crankshaft New Genuine Honda OEM Bearings Genuine Honda (Measured and fit for perfect clearences) Hardware New OEM Honda Squirters & Thrust Washers 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.
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