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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1961 GMC Suburban 305A Overdrive
1962 GMC Utility 305D
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