Cam only spark plug gap?
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If it's a stock long-block LS1 with no power-adder I'd recommend the TR55's gapped .050" as a starting place. Many times you will be fine with a bit wider .055" or even .060", you just have to try it and see if the extra gap causes issues (blows out).
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
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POWERBOND - ASP - AND MORE!