Racing motors

The motors

Built in-house to AKRA, NKA or WKA rules, restricted or unrestricted, run on the dyno, and sent out ready to race. Tell us your class and your track and we build to it.

HEAD ACHE Series
House Engines
Short Blocks, Heads & Kits

HEAD ACHE Series

Our clone engines, built to the current rules and a headache for the competition. Over a thousand built.

A purple Head Rush engine with the decal on the recoil cover

HEAD ACHE Series HEAD ACHE Series Clone Clone 350 · Clone 375 · Clone Medium · Clone Heavy · Junior classes The flagship: a clone built to the current rules with a ported head and our own HR cam, dyno-run before it leaves. Call for pricing

A white Head Rush engine, carburetor side

HEAD ACHE Series Predator & 212 Builds Stock appearing · Hobby Predator · Budget Predator · 212 classes Predator, stock-appearing and 212 builds done the HEAD ACHE way, for the classes that run them. Call for pricing

House Engines

Freshened, dyno-tuned engines with zero laps, ready to bolt in.

A white Head Rush engine from the pull-start side

House Engines House Engine Clone classes A freshened engine with zero laps, dyno-tuned and ready to race, when you need one now. Call for pricing

A purple Head Rush engine, recoil cover and fuel line

House Engines Convert Your Engine Clone classes Another builder's engine brought up to HEAD ACHE spec, reusing what's good. Call for pricing

Short Blocks, Heads & Kits

Short blocks with the HR cam, ported heads bare or assembled, race-ready carburetors, and full engine kits for the do-it-yourselfer.

Short Blocks, Heads & Kits Short Block with HR Cam Builders Our short block with our cam in it, for the racer who finishes the build himself. Call for pricing

A black Head Rush engine in a yellow kart

Short Blocks, Heads & Kits Full Engine Kit Do-it-yourself Everything to build one yourself, the parts we would use. Call for pricing

Every build

Don't see your class?

Tell us what you run and where. We'll build to it.

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