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Old 03-31-2011, 02:17 PM
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Racing Head Service cast iron guides #12407-01 or premium guides #12410-01 instead of L31's. Thick wall casting, set up ready to bolt on out of the box. No jacking around or machine work like you have to do with L31's.

Some fellows say that the casting is generally OK on the Patriots, but the components used to assemble are not the best. Buy the bare heads and assemble them with good parts.
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