Honda has produced some of the most celebrated engine families in import tuning — and the JDM market carries variants that never officially came to the U.S. in factory trim. This guide maps the major Honda engine families you'll encounter when shopping for a JDM engine, including what each code is built for, where it came from, and how to compare them against what Honda offered in the U.S. market. It's a companion to our engine codes guide.
The K-series: Honda's most-swapped modern four-cylinder
The K-series (K20, K24) is the dominant swap engine in Honda's lineup, appearing across Civic, Integra/RSX, Accord, and CR-V platforms from roughly 2001 onward. See our full breakdown in K20A vs K24A.
| Code | Displacement | Main vehicles / notes |
|---|---|---|
| K20A | 2.0L | JDM Civic Type R, Integra Type R; highest output K-series |
| K24A | 2.4L | CR-V, Accord, Element; more torque, broader street use |
The J-series: Honda's V6 family
The J-series powers Honda's mid-size and premium lineup — Accord V6, Odyssey, Pilot, MDX — and Acura's full range from TL to MDX to RDX. These are SOHC VTEC V6s with a very different character than the four-cylinder K-series: smooth, torquey, and designed for comfort rather than peak power.
| Code | Displacement | Main vehicles / notes |
|---|---|---|
| J35A | 3.5L | Accord V6, Odyssey, Pilot, MDX (2001–2009); current range $499–$1,499 |
| J37A | 3.7L | Acura TL (2009+), MDX (2010+), ZDX; higher output, current range ~$3,299 |
B-series and older Honda engines
Older Civics and Integras used Honda's B-series (B16, B18, B20) — DOHC VTEC four-cylinders from the 1990s that remain popular in the classic Honda community. The B18C1 (JDM Integra Type R, 1.8L) is particularly sought-after. These are older engines and availability in good condition is more variable than K-series units. The F-series (2.0L, 2.2L) covered mid-generation Accords before the K-series arrived.
JDM vs USDM Honda highlights
The JDM advantage in Honda engines is most pronounced in the K20A: the JDM Type R-spec K20A carries a factory output advantage over the USDM K20A2 from the RSX Type-S, thanks to a higher-compression head and different cam profile. See the full breakdown in our JDM vs USDM guide.
What to look for in a Honda JDM engine listing
- Confirm the full code, not just the family — K20A and K20A2 are different engines.
- For K-series, ask whether the listing is engine-only or a complete swap package with transmission and ECU.
- For J-series V6 replacements, confirm the model year range your chassis needs — the J35A was used across many years with internal revisions.
Frequently asked questions
Which Honda JDM engine is best for a Civic swap?
It depends on the generation of Civic. For an EP3 chassis, the K20A is the factory match. For an older EK or EG chassis, a K-swap requires mounts but is the most popular modern option. Older B-series installs are simpler in those platforms because they're designed for that engine bay.
Are Honda J-series V6 engines reliable for high-mileage use?
Yes — the J35A and J37A are among the more durable Honda engines in terms of documented long-term reliability. They're not performance-oriented engines, but they're very well-regarded in the commuter/SUV replacement context.
How do K-series prices compare to J-series?
K-series four-cylinders typically run $749–$1,749 from our current stock; J35A V6s are similar at $499–$1,499, with J37A units higher at around $3,299 given the larger displacement and later production. See our cost guide.
Shop Honda engines
Browse K20A, K24A, J35A, all Honda engines, and all Acura engines. See the full JDM engine inventory.