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Exhaust Question

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10-18-2011, 01:39 PM	#1
69Time1 Registered User Join Date: Oct 2011 Location: Houston Posts: 3	Exhaust Question I have a 350 in my 69 GMC (after market motor 74') On my exhaust manifold (driver side) there is a lever. Does anyone know what the lever is called and what it is for? It appears to adjust the exhaust flow..

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