I've seen three versions of the #590 PCV valve: a black #590 with a short body, a black #590C with a longer body, and a silver #590C with the longer body. I think the short black 590 may be the only one used on early '63 Corvettes, but I'm not sure. Perhaps the 590C was used on late '63 or early '64 Corvettes.
Can anyone tell me the original assembly line application for the longer black 590C valve? I'm pretty sure the silver version that pops up on eBay is just a service replacement.
Can anyone tell me the original assembly line application for the longer black 590C valve? I'm pretty sure the silver version that pops up on eBay is just a service replacement.
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