Does anyone recognize this part. Looks important. Just buttoned up the timing cover change job on my 273 and found this part. It has a 5/16-18 screw w/ hardened 5/8" dowel. I know it fits a counterbore on the block somewhere. Got engine running..next morning a few cups of water under car but not sure if the two are related. All water jacket bolts got sealant.
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