C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Plenum differences?

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Old Jun 7, 2008 | 12:25 AM
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Default Plenum differences?

I'm wondering if anyone knows the physical and functional differences in the stock plenums between years? I have an 89 and was wondering if an earlier or later plenum would work? I found info online stating they are different, but I don't know why. My plans are to port the plenum (at home) and I'd rather buy a used one to practice on.

Matthew

Info found:
Q: Are all plenums the same?
A: NO! Sure they all work the same. There is no difference between one found on a 305 to one from a 350. The difference is in the year of manufacture and it's application. The 1985 thru 1988 cars used part # 14081006. 1989 cars used a one year only plenum # 10108468. The 1990 and up use # 10077151.
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Old Jun 7, 2008 | 01:17 AM
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This link should help with all the differences.The earlier plenums should still bolt in the same,but see the pics on the links for the differences.

http://www.hotrodlane.cc/Streetstories/choosingtpi2.htm
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Old Jun 7, 2008 | 12:44 PM
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Thanks that's a great link - there's more info, too in the other pages on the site.

Matthew
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