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

Just checking

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Old Feb 25, 2006 | 12:59 AM
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Default Just checking

Trying to get factory exhaust manifolds for my car. Anyone know if there is any difference in exhaust manifolds from 85-91 (emissions placement, size, material, etc.)? I some how doubt it but then again you never know.
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Old Feb 25, 2006 | 03:02 AM
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I'm pretty sure '85-'91 intake manifolds are all identical. The only difference in exhaust is everything behind it. The pipes after the manifolds are '84-'85 = 2 1/4" and '86-'91 = 2 1/2".
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Old Feb 25, 2006 | 04:04 PM
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The 1985 doesn't have the exhaust supply tube for the EGR that the 1986 and up have. Part number wise, the 1986, right side is a loner. My guess is that is because of a difference in the way the EGR exhaust tube connects. The 1986 through 1989 left sides are the same, as are the 1987 through 1989 right sides.

RACE ON!!!

PS. Hey! Central Coaster. I'm ASSUMING something here. Come and berate me.
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