The million-dollar Orange County International Raceway opened in Irvine in 1967 as the first quarter-mile "supertrack" in drag racing. It closed in Oct. 1983.
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There are at least a couple good histories of the OCIR available online, including on on the NHRA website, and another at a website called Competition Plus.
Chris Epting visited the site of the old OCIR and took the photos below. He writes, "I was doing a Forgotten O.C. segment today [for KOCE-TV] at the site of the O.C. International Raceway. It was hard to find a trace of ANYTHING - but the Sand Canyon Ave. gate is still there. ...It's on Sand Canyon right by the entrance to the 133, between Laguna Canyon Road and Burt Road" 
"In this shot, [below,] I lay out about where the track sat," writes Chris. "The red dotted line shows the location of Technology Drive."
