Guys, I have a bad Freeze Plug, I ordered a set from Bobs Buick but they are too large. When I called Bob he stated oh you have those engines but didn't have a size for me or a recommendation on where to go.
Currently I have two 263 engines and I need freeze plug sets. Bob stated during mid year they had a block with different sizes. Any ideas, I can MIC the hole size and get a number.