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Honda K Series Billet Block.

The Bullet K series to suit all Honda K Series applications has been engineered to deliver reliability in 1700hp environments.

Now 2 models available K20 & K24

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Full specifications

The Bullet K series to suit all Honda K Series applications has been engineered to deliver reliability in 1700hp environments.

Now 2 models available K20 & K24

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.

The Bullet Honda K series comes in 3 models, Wet or Dry Deck (open or closed deck) with water jackets & a Solid Drag only version.

So Street-Strip-Circuit-Bullet has you covered!

the bullet difference
member resource
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 ARP 8740 1/2” Head and 7/16” Main studs.
Modifications required to fit Remote oil filter & external oil pump required. Electric water pump.
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.

the bullet difference

head sealing

The optional Bullet Fire Ring head sealing system uses a metallic gasket with grooved brass rings for the cylinders that provide exceptional head sealing under ultra high loads.


Increased deck thickness increases rigidity and stability for better head gasket sealing.


Bullet supply premium studs and block plugs with all billet blocks.


Our blocks are machined from 6061 aircraft-grade billet aluminium, so they are much lighter than cast iron alternatives. Typical weight savings are more than 20kg.


Our unique design incorporates siamese bores, dry sleeves and a one-piece cradle resulting in maximum rigidity. Cylinders stay round and piston rings seal better under high load resulting in more power.

4 bolt mains

Four bolt, billet one piece main cradle improves bottom and rigidity to reduce main tunnel deflection under extreme load. The cradle is made from the same material to ensure equal expansion rates and maintain a  round bearing housing at different temperatures.


Bullet’s registered designs are developed to identify and eliminte structural weaknesses in OEM blocks. They are built to exceptionally precise tolerances for exceptional results.


Cooling system design improvements and efficient fluid paths are a significant feature of the Bullet block.

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