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are stock manifolds the same?

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Old May 11, 2017 | 02:07 AM
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Default are stock manifolds the same?

are all stock exhaust manifolds on LS based engines the same? meaning exhaust port shapes.

will any stock manifold fit on a 98 LS?

thanks
mike
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Old May 12, 2017 | 12:51 AM
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Port shape is the same, configuration is different. 98-99 is the same, 00-02 is different.
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Old May 12, 2017 | 01:08 AM
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So any ls manifold will work? Im not worried about where it exits.

the reason im asking is im taking my long tubes off and switching my whole exhaust. Its a stock 98 and its in an 88 iroc. I know the 98s were the worst years for ls but want a better exhaust manifold for now before eventually getting shorties or mid lengths.
i cut my drop springs and like where/how my car sits but the long tubes are scraping the ground, so ground clearance is my problem.
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Old May 12, 2017 | 08:27 AM
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Yes, they will all bolt on there.
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Old May 12, 2017 | 08:50 AM
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its my understanding the 00-02 stock exhaust manifolds flow better than my 98-99's did. maybe even look for 01-02 z06 manifolds.
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Old May 12, 2017 | 09:43 AM
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Dorman makes 01-02 manifolds... exact replacements.
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Old May 12, 2017 | 09:53 AM
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JBA made a coated shortie but they are new about $500. maybe look for used?
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Old May 12, 2017 | 06:37 PM
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BBK sells chrome shorties for $350
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Originally Posted by RevGTO
Port shape is the same, configuration is different. 98-99 is the same, 00-02 is different.

Correct. 98-99 had a different manifold due to placement of the catalytic converters.

Any manifold will bolt to the block, bolting to the y pipe is a different story
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