cords Posted May 11, 2019 Share Posted May 11, 2019 Any one know the size of the freeze plug just under the head on the side of the block on a 1956 322 Link to comment Share on other sites More sharing options...
superbuick Posted May 13, 2019 Share Posted May 13, 2019 Just installed a set , Dorman # 555-052 You should be able to cross reference the number. Buick used some odd sizes. Most in 64ths. Link to comment Share on other sites More sharing options...
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