I'm running the "270H" Xtreme grind in my '67 396 in a '82 Chevy :)
Advertised duration: 270 intake/278 exhaust
Duration at .050 in.: 226 intake/234 exhaust
Gross valve lift: .544 in. intake/.564 in. exhaust
Lobe separation: 111 degrees
Runs great in the big block, nice idle and pulls great... make sure you save
yourself from "down the road blues" and order the whole K-Kit from Comp,
comes with correct springs, locks etc
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