ZR-1 Net Registry Forums - drainage hole info

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zpyroro

08-11-2022 12:21 PM

drainage hole info

Anyone know where I can access the info on how to open up the drainage hole under my he plenum? There was a GM service bulletin years ago about this. Thanks

Young1

08-11-2022 07:48 PM

Re: drainage hole info

There is a bulletin to drill a 3/8 hole in the rear of the block in The Valley of the plenum. Why not use a drill bit, a stiff wire and an air blower to clear the oem tube? You have to pull the starter to do either anyway.

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