Rough — engine program only.
Stand-in numbers to frame the scope — the builder's quote replaces these.
| Phase | Range |
|---|---|
| Engineering, design, mock-up (CAD, patterns, fixtures) | $8–15k |
| Teardown, inspection, machine work | $18–28k |
| Rotating assembly | $14–20k |
| Valvetrain and cams | $5–8k |
| Induction (ITBs, manifolds, cast plenum + pattern, airboxes, DBW) | $18–30k |
| Engine management + calibration (ECU, harness, sensors, 40–80 dyno hr) | $18–32k |
| Oil and cooling | $10–15k |
| Exhaust | $6–10k |
| Integration and assembly | $8–14k |
| Shakedown and refinement | $5–10k |
| Total (incl. ~20% contingency) | $130–220k |
Excludes suspension, the UN1 upgrade (already done), tires, brakes, bodywork, consumables. One-off programs at specialist shops routinely overrun — plan against the top of the range, not the middle. A larger-bore path (custom wet liners), if taken, adds roughly $5–12k on top — more if the liner seats must be machined for a larger OD.