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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old October 24th, 2016, 04:06 AM
GBCustoms GBCustoms is offline
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Default What is the flap in the right side exhaust?

Ok, I'm sure I am just ignorant, but what is the exhaust flap thing in the right hand side exhaust?
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Old October 24th, 2016, 05:25 AM
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Default Re: What is the flap in the right side exhaust?

It's a heat riser valve;

The heat riser valve is located between the exhaust manifold and the head pipe and is used to hasten the warm-up of a cold engine. Malfunctioning or frozen valves can cause loss of power or exhaust manifold damage.
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Old October 24th, 2016, 11:23 AM
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Default Re: What is the flap in the right side exhaust?

You can remove it with out any problems if you want.
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Old October 24th, 2016, 03:35 PM
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Default Re: What is the flap in the right side exhaust?

Crazy exhaust guy left mine in, I just leave it open. Doesn't hurt a thing.
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Old October 24th, 2016, 10:57 PM
GBCustoms GBCustoms is offline
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Default Re: What is the flap in the right side exhaust?

Thanks for the info! Yeah mine was rusted about 1/4 of the way open. I just dropped out the exhaust to get the new 3" with a flowmaster 50 welded up!
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