Honda K-Swap Guide: K20 vs K24, What Fits, and What You Actually Get

The K-series swap is the most popular engine swap in the Honda world for good reason: huge power potential, strong bottom ends, and bolt-in support for almost every chassis. Here is how to pick the right K motor and what to check before you buy.

K20 vs K24: the short version

The K20 is the high-revving 2.0L — think Type R and RSX, with the strongest factory head flow and the most aggressive VTEC. The K24 is the 2.4L torque motor — more displacement, more low-end, and a favorite base for the classic K24 block with K20 head build. Want top-end scream? K20. Want streetable torque? K24.

Which K-series fits my chassis?

• EG / EK / DC2 (90s Civic and Integra): the classic K-swap — needs swap mounts, axles, and a shifter setup.
• EP3 / DC5 (RSX, Civic Si): K-series from the factory, the easiest path.
• ES / EM2 (01-05 Civic): popular, well-supported swap.
• 8th-gen Civic and newer: often K24 based already.

Always confirm your harness, ECU, and transmission match the motor. Use our fitment finder or call before ordering.

What comes with a JDM K-series

Our complete K-series long blocks are compression tested and typically include the head, block, intake manifold, and accessories as pictured. Transmissions, ECUs, and swap hardware are often sold separately — ask us to confirm exactly what is included for the unit you want.

Common K-swap mistakes

• Buying a K20 head without matching the right block for your power goal.
• Forgetting the swap needs mounts, axles, shifter, and often a different ECU.
• Skipping the compression check — always ask for the numbers.
• Mismatching the transmission to your axles.

Buy your K-series in LA

We stock JDM K20 and K24 motors at our Vernon warehouse, compression tested and ready. Southern California buyers can drive in and inspect before paying. Browse Honda engines or call (442) 888-0318 — new customers save with code JDMLA10.