Honda K Series Billet Cylinder Block

The Bullet K series to suit all Honda K Series applications has been engineered to deliver reliability in 1700hp environments. .
This product has vastly improved block rigidity and improved deck thickness over the stock unit.
Distortion of cylinder bores and crank tunnel is dramatically reduced through increased material thickness and a Bullet 4 bolt main cap system.
This product requires minimal modifications to directly replace the standard block.

They are available in 3 variations:

Name of product: Honda K Series (suits all K series applications) Actual weight: 36kg
Block material: 6061 aircraft grade billet aluminium.
Design improvements: 4 bolt mains, increased block deck and cylinder wall thickness. Ductile iron performance sleeves fitted. Studs included: 1/2” Head and 7/16” Main
Modifications required to fit: Remote oil filter required. Electric water pump. External oil pump or dry sump may be required. Modifications to head required: Drill out head stud holes to 14mm. Two head dowel counterbores need to be increased to 15mm HP rating: 1700*
Significant benefits: Significantly increased rigidity and durability. May be bored to 89mm. Finish: Raw machined.
Options Available: Bullet Fire Ring Head Sealing System. Wet Deck, Dry Deck and Solid Block options.

For more info on Honda K Series Billet Cylinder Block please go here.

For info on our full range of goods and services please go here.

Bullet has been in business for more than 20 years and has built an enviable reputation as a premium motorsport engineering house. In the last 15 years we have invested in cutting edge DMG Mori and Haas 4 axis CNC machinery, CAMplete Port CNC Porting Software, Solidworks 3D modelling software, SolidCAM CNC Programming software, and recruited staff with the knowledge and experience to create and develop world-beating new products.

Along with our manufacturing capability, our combined decades of experience with our SuperFlow flow bench and engine dynamometer enables us to build and tune engines that are fully proven and ready to race.


  • CAD (Computer Aided Design) / CAM (Computer Aided Manufacture)

  • Precision CNC machining

  • Finite Element Analysis

  • New product development

  • Bespoke engine building and dyno tuning

  • Largest CNC Head porting program library in Australasia

Discriminators (points of difference)

  • In business more than 20 years

  • More than 100 years combined industry experience in our workshop

  • Comprehensive in-house facilities means no need to outsource

  • Decades of experience in CAD/CAM

  • Export to anywhere in the world

  • Manufacture individual components up to turn-key engines