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LS3 heads exhaust ports

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Old 12-28-2014, 04:11 AM
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Default LS3 heads exhaust ports

Are LS3 heads exhaust ports located in the same spots as all cathedral head exhaust ports? My custom headers don't allow a ton of movement, so this is pretty critical. I'd like to step up to a bigger bore, square port heads.
Old 12-28-2014, 11:25 AM
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Never owned cathedral heads but I believe they don't fit. Go to the muffler shop, do a flange change and mock up and still keep your favorite header.
Old 12-28-2014, 12:02 PM
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I believe they will, bolt holes in the same place just the ls3 have a little bigger exhaust port but should seal.
Old 12-28-2014, 02:50 PM
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The exhaust ports exit the same as cathedral heads. I reused my edelbrock headers from my stock ls1 to iron 6.2L with L92 heads. No issues.
Old 12-29-2014, 03:53 AM
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Originally Posted by moeZ28
The exhaust ports exit the same as cathedral heads. I reused my edelbrock headers from my stock ls1 to iron 6.2L with L92 heads. No issues.
Thanks, i wanted to make sure the runners weren't raised or anything like that. Clearance is tight.



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