• Remove head; tag and bag all fasteners and components.
• Machine shop: dye-penetrant/magnaflux, check flatness, weld if feasible, magnaflux re-check, machine deck to spec.
• Replace head gasket, torque-to-yield bolts or ARP studs, new valve seals/guides as needed.
• Flush cooling lines, replace coolant, replace oil and filter.
• Re-tune conservatively; perform dyno heat cycles and monitor temps and knock.
• Road/race test with logged telemetry; gradually return to prior power levels if stable.

If "Racelab" refers to a custom sim racing rig or cockpit component (common in DIY and enthusiast circles), a "cracked top" typically involves the wheel deck Common Causes

You can set up your standings to highlight "cracked" (elite) performance automatically: racelab cracked top

iRacing Max Cars

: Set your in-game "Max Cars" to 63 so the overlay can accurately track the entire field's performance. Racelab Cracked Top: The Ultimate Guide to Performance