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Focused on precision tuning for older vehicles with modern engine swaps

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Trusted by builders, racers, and enthusiasts across the Midwest

Tuning software we work with

HP Tuners FuelTech Holley EFI

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Tell me about your project

I take on a limited number of projects each month. Fill this out and I’ll reach out if your car is a fit.

What we calibrate

Engine swap tuning for the Midwest

Hill Boys Tuning is a one-person calibration shop based out of Eureka, MO. Focus is older vehicles with modern power — LS swap tunes around St. Louis, Holley start-up files, OEM ECU bench flash, and full in-person calibration when the car is ready.

Start-up / base files

Bench flash an OEM ECU, or a start-up file for Holley and other aftermarket ECUs so the swap fires safely. Start-up fee credits toward a full tune. Local load in greater St. Louis when available.

Full in-person calibration

Drop-off work on drivability, idle, cold/hot start, coast-down, and safe WOT fueling and timing. Overnight cars are garaged. Limited projects each month.

Track or dyno support

On-site support when you need load pulls dialed in for the street, strip, or dyno — fueling, timing, and boost targets kept safe for the combo.

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Some of our work

From restomods to late models — here’s a look at some builds we’ve brought to life.

Restomod engine swap project Midwest classic with modern powertrain Engine bay after LS or late-model swap Custom restomod build Swap calibration project Street restomod with modern EFI Late-model power in an older chassis Engine swap build in progress Holley or OEM EFI swap project Track-ready swap car St. Louis area swap build Restomod drivetrain install Modern engine in a classic car EFI conversion project Calibration customer build Midwest engine swap Finished restomod project

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