Seedee Posted July 4, 2022 Share Posted July 4, 2022 (edited) So, in my slow preparations before sending the block out to the machine shop I noticed these orifices or "restrictiors" that look pretty corroded. At the front of the block on both sides. I can't tell if they were casted (which I highly doubt) or are they a type of core plug punched in during assembly. Fearing they won't survive the cleaning process I'm curious if there's a mention of these "restrictiors' in anyone's parts book? Or I have to fabricate a replacement. You can't tell in the photo but there is a lip around the opening. I figured best would be just to drill the same diameter into a steel core plug and drive it in. But any insight would be appreciated! Edited July 4, 2022 by Seedee (see edit history) Link to comment Share on other sites More sharing options...
Larry Schramm Posted July 4, 2022 Share Posted July 4, 2022 I would say required to control coolant flow evenly through the engine. Not that unusual. Sometimes you see them as part of the head gasket. I would definitely keep them and replace them if the do not survive the cleaning. Link to comment Share on other sites More sharing options...
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