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Our recommendation is with a stock engine & stock pulley -- keep the stock plugs and use the recommended oil weight that GM suggests.
There is a lot of talk of dropping one degree on the plugs, but we do not have a recommendation on that.
That being said, I have dropped my pulley from a 3.3 (stock) to a 3.1 and am still running my stock plugs & 'stock' 5w30 mobil1
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