HomeSportsDiamond Mountain Speedway – Test and Tune Weekend 1Diamond Mountain Speedway – Test and Tune Weekend 1Mon, March 7, 2022 Facebook Twitter LinkedIn Pinterest E-Mail Diamond Mountain Speedway, at the Lassen County Fairgrounds, Test & Tune Saturday 3/12 2-6 Sunday 3/13 12-4 Car & Driver $50 Pit ppl $30 Open to all classes