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International Automotive Technicians Network
Re: GM Exhaust pipe valve
Posted to Technical Discussion Forum on 6/30/2025

Hi Louis,

I have cut the flapper out of many frozen/rusted one's way back in the day. I also updated quite a few on restoration vehicles with brass shaft bushings. Those heat riser were a vital part of cold engine warm up.

Same thing happened with EGR valv... Login to read more.