Every part for a boosted K20 or K24, in the order you'll fit it.
Most boosted K builds start from a K24 bottom end, often with a K20 head, so check which pistons and gaskets match your combo. Every part here fits the K-series and is sold on epoxy54.com.
Customer build · @benboxall23
- 1. Block
- 2. Head studs
- 3. Pistons
- 4. Rods
- 5. Bearings
- 6. Head gasket
- 7. Valvetrain & cams
- 8. Fuel
- 9. Oil & boost
Block reinforcement
The K20 and K24 are open-deck blocks. EPOXY54 fills the top 3/4" of the water jacket for closed-deck strength without machining or sleeves, and coolant still flows underneath, so the car can stay on the street. Do it first, on the bare block. It's block insurance for every part you bolt on after.
- EPOXY54, Inline 4 / Partial Fill300 ml kit for K20 and K24. 21,000 psi compressive strength, 1:1 thermal expansion with aluminum.
- EPOXY54 Install Kit5/32" drill bit, install bottle and stir stick.
How it's done: K20 / K24 closed deck conversion · Installation guide · Fill volume guide
Head studs
Boost raises cylinder pressure and tries to lift the head. Studs clamp more evenly than the factory bolts and can be reused.
Forged pistons
Match the piston to your block, head and bore. Dished pistons lower compression for more boost. 87 mm is the stock K24 bore, 87.5 mm is 0.5 mm over, and 86 mm is the stock K20 bore.
- K24 / K20 head, 87 mm, -21ccBig dish for high boost on the classic combo.
- K24 / K20 head, 87.5 mm, -21ccSame piston for a block bored 0.5 mm over.
- Pistons and rings, 87.0 mm, 10.0:1K24 with K20 head, rings included.
- Pistons and rings, 87.5 mm, 10.0:10.5 mm oversize version.
- Flat top pistons, 86 mmStock-bore K20.
Connecting rods
Stock K rods are the usual weak link once boost goes up. Forged 4340 rods with ARP fasteners are the standard fix. Buy the K20 or K24 length to suit your block.
Bearings
Fresh rod and main bearings on any rebuild. Measure your clearances and pick the size to suit.
Head gasket
A multi-layer steel (MLS) gasket seals better under boost. Pick the bore that matches your pistons and the thickness for the compression you want.
Valvetrain and cams
Boost wants stiffer springs to keep the valves closed, and a cam designed for forced induction.
Fuel
Boost needs more fuel than the stock injectors and pump can supply. Size the injectors for your power and fuel (E85 needs more), and upgrade the pump to keep pressure up at high load.
- 1000cc Bosch EV14 injectorsSet of 4 for K20 and K24.
- 1500cc Bosch EV14 injectorsFor big-power or E85 builds.
- K-series fuel rail kitFor RSX and Civic Si K20/K24.
- USCAR to Honda injector adaptersPlug-and-play for EV14 injectors.
- DW400 pump module, 06–11 Civic Si415 lph drop-in module.
- DW400 pump module, 12–15 Civic SiFor Civic Si and ILX K24.
- DW300C pump, RSX340 lph with install kit, 2002–2006 RSX.
Oil and boost
Hard launches and long corners can starve the oil pickup, so baffle the pan. Want boost without a turbo? A supercharger kit bolts on.
See it in real builds
K-series and Honda builds running EPOXY54 are on our customer builds page. Questions about your combo? Call (604) 809-7398 or email support@epoxy54.com.
Shop all K24 partsShop all K20 parts