Nope,
Its was built by HCI in Sacramento, CA. The stock engine made 540 with ice in the aftercooler. He blew a rod, so he built the bleock, and lowered the compression. Going to the track in a couple weeks
With some serious boost,that number isn't the least bit unrealistic. He has a built motor so odds are it has some cams and maybe some head work. With 16-18 pounds of boost and an aggressive tune on the motor that number is attainable.
ya, thats harolds cobra....hes tight....in the 98cobra.com 1st annual car show, him and i got first and second place in our catagory. and i was at the last 98cobra.com meeting before that car show, but i didnt have my front air splitter then. hes tight, awsome cobra. great guy.....and ya, hes running with a solid-rear axle....bassani offroad xpipe, and bassani catback...stock suspension from looks of me, except the live-axle.
Look at the link above, picture #7 says it all.
He has a built solid rear witha Viper T-56, Mccloud clutch. He is running 14 lbs of boost. When he made 622, it was w/o ice in the aftercooler. When we added ice, it had belt slippage, and the hp went down. He was also on 100 octane.