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Camshaft Recommendation

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You said you were having a 6 liter built, is it a 6.0 with LS3 heads or are they cathedral port 6.0 heads?  If they are LS3 heads meaning it's an L76 or LY6 motor with 5364 0r 823 casting then an LS3 cam is fine. If it's a 6.0 with cathedral port heads you will want to stay away from an LS3 type cam as they are spec'd completely different from a cam built for a cathedral port head. Cams for cathedral port heads will have a tighter duration say 232/236 duration, a LS# cam would be more like 232/241 due to the poor exhaust flow and exceptional intake flow.

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