Not an olds guy but have 2 plugs one with a hole and one with just a plug. Also one hole with two spikes on the side of the hole. What do you do with these? A friend gave me a block heads and a crank. Block checked out okay and now piecing together this 324. Sent from my iPhone using H.A.M.B.
That is a restrictor, I've seen them in other engines used to limit the flow so other areas are not deprived of water flow. The "2 spikes" would be to ensure the plug does not drop down into the block, the head or head gasket would prevent movement the other way. There may be a GM bulletin on them or info in the service manual as to why and where they should be.
They do not See the photo from shop manual, all arrowed passages need to be open without plugs like in your photos
Keith while we are looking at pics it would be a good time to point out the oil galley plugs in the front of the block near the timing chain. One has a small hole for oiling the chain. Often overlooked, just thought I would mention it for clarity. Could save you a lot of aggravation later on
Thanks, yes I did take those out before I got it tanked. Got an extra motor to, but the block has a big chunk blown out of it, so I got all the parts of of it. Been checking out other posts on the hamb. Lots of info on these motors, but didn't see anything on the frost plugs. The cracked block had been rebuilt, but the plugs in the pictures where not in it. Someone must have takin them out and not replaced them. Are they necessary? Can you get the ones with the holes in them?
The cooling plugs referenced by Paul would be necessary in my opinion. Machine shops should have them or can source them.
I am not a expert on these motors but be careful that there were not any later updates not in the manual as to location, size or removal all together. Too many times do I see service data in the original manual contradicted by later bulletins. Does anyone know of a source for old GM service bulletins?