Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Skip Wite Performance 383 or ZZ383 crate motor???
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Old 12-29-2009, 12:07 PM
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Location: Kingsport TN
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I really don't know if they are heat treated to this number. According to our head builder the seat material is just as it should be. We have encountered no problems with these heads. I did an intentional overheat test on them once, and never harmed them. We were doing a fan off test to see how long it took our new Super 16 fan to cool the engine back down. We ran the engine to 235 for several minutes. Then my driver did an unintentional overheat on them by forgetting to turn the fan on. The engine went to 245 for several minutes.
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