Kelford

The best camshafts for a Subaru EJ25 or EJ257 build are the ones matched to how the engine will actually be used: a mild Stage 1 set for a street-driven STI, or a longer-duration, higher-lift race profile for a dedicated track or rally car. This Kelford collection covers that full range for the EJ25 STI from 2005 on with AVCS, plus matched valve spring kits, so check your year and model before ordering.

Camshafts control when the valves open, how far they lift, and how long they stay open, which shapes where an engine makes power. Longer duration and higher lift generally move power higher in the rev range and demand supporting parts: stronger valve springs and careful tuning. That is why this range runs from Stage 1 through Stage 5, with 272, 282, and 290 degree racing profiles in between.

Brands in This Collection

Kelford is the sole brand here, and the products define its specialty: camshafts for Subaru EJ engines, organized by stage and by duration so builders can pick a profile instead of guessing. The Race and Rally set and the 272, 282, and 290 degree racing cams target competition-style builds, while the Stage 1 set is the entry point for milder cars. Kelford also covers the supporting side with a WRX single spring kit, an EJ20/EJ25 spring and titanium retainer set, and a valve spring set for the Toyota 86 and Subaru BRZ, because higher-lift cams are only as good as the valvetrain controlling them.

Builders should also compare GSC Power Division, another camshaft-focused range in our engine catalog. GSC gives EJ builders a second set of grinds to compare on lift, duration, and intended use, which is the practical way to match a profile to a turbo and a rev limit.

Brian Crower takes a broader engine-internals approach, covering cams alongside stroker components and valvetrain parts for full builds. It suits builders opening the engine once who want the cam planned with the bottom end. Supertech is the valvetrain specialist in that same conversation, best known here for valves and springs that pair with aggressive cam profiles.

Round out the build by browsing cam gears, performance valves, and crankshafts, and read our EJ257 engine guide before finalizing a combination.

Frequently Asked Questions

Do I need valve springs with Kelford cams?

For higher-lift and longer-duration profiles, yes: plan on matched springs and retainers, and this collection includes Kelford spring kits for that reason. Confirm the specific cam's requirements before installation.

Is a tune required after a camshaft swap?

Yes. Cam timing and lift changes alter airflow throughout the rev range, so the engine needs professional tuning to run safely and make the expected power. Budget for tuning as part of any cam install.

Which stage is right for a daily-driven STI?

Start at the mild end: Stage 1 profiles are the natural street choice, while the Stage 5 and 290 degree sets are racing profiles that trade low-speed manners for top-end output. Check your year and model, and match the stage to your turbo and goals.

How difficult is installation?

This is advanced engine work involving timing and valvetrain assembly, not a bolt-on. Most owners should have an experienced Subaru engine builder install and degree the cams.