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Old 11-17-2003, 04:52 PM
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Intake Manifold Bolts - Need Sleeves??

I just bought a Vortec Intake manifold for my newly aquired vortec heads. The heads are angle bored for a 5/16" intake manifold bolt. The intake manifold bolt holes are 3/8" oversize. So if I use stock 5/16" there is play.

Which bolts to use? 5/16" w/ some type of sleeve? A special 5/16" with a "thicker" neck below the head? Any suggestions please.

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Old 11-17-2003, 05:08 PM
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I'd suggest using flatwashers under the intake bolts. Preferably hardened and plated.
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Old 11-17-2003, 10:44 PM
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As I remember it, I bought my bolts from Chevy. I think they were 5/16".
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Old 11-17-2003, 10:47 PM
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sounds right to me.
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Old 11-18-2003, 12:20 AM
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Check and see if they are metric.

Troy
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Old 11-18-2003, 01:00 PM
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intake bolt is GM part # 12550027
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