GMPP 350 Crate Engine Upgrade - The JP 350 Part 1
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It's tough to see, but the factory Vortec heads feature a complicated 5-angle valve job that some machine shops can't duplicate. If you can't score a set in the boneyard that doesn't need refurbishing, it's usually better in the long-run to simply buy a new set of heads from GM Performance Parts since often times a standard valve job will actually hurt flow. View Related Article
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