383 block

[Jim Milburn]

Just doing a little inspection of the 383 block and noticed this while looking thru the freeze plug. Is this something to be concerned with? Looks to be a blockage between cylinder walls. Runs from the top to about halfway down. If it is, how do I fix it?

 

[toolmanmike]

Just doing a little inspection of the 383 block and noticed this while looking thru the freeze plug. Is this something to be concerned with? Looks to be a blockage between cylinder walls. Runs from the top to about halfway down. If it is, how do I fix it?

View attachment 1315042

Probably casting sand. It needs a thorough cleaning inside.

 

[Jim Milburn]

Probably casting sand. It needs a thorough cleaning inside.

Hot tank?

 

[toolmanmike]

Hot tank?

You can do it in your driveway but it should get hot tanked anyway when it goes to the machine shop. I had a couple expansion plugs seeping and the block was full to there with core sand. They didn't shake them out good enough back then.

 

[Jim Milburn]

You can do it in your driveway but it should get hot tanked anyway when it goes to the machine shop. I had a couple expansion plugs seeping and the block was full to there with core sand. They didn't shake them out good enough back then.

I’m lucky, I guess. Block doesn’t need any machine work.

 

[gdrill]

More common than one thinks.

 

[Jerry Hall]

I’m lucky, I guess. Block doesn’t need any machine work.

I would take it to the machine shop and have them hot tank it, you won't be sorry.

 

[Mopar Hunter]

Mine had that too, I took a coat hanger to knock some out of each freeze plug. I went around each cylinder as best as I could. A lot came out, I know I didn’t get it all. Best I could do while the 383 was still in the car.

Damn I love working on these old cars.

 

[bandit67]

Most every old block I pull the two bottom block cooling plugs out are completely plugged up with "gunk". Most are pretty hard and I bet it is mostly from left in sand from casting. Any v 8 I change coolant in I pull those plugs and flush out the block thoroughly . I find very little crud in most all the aluminum 4 banger blocks I mess with.

 

[Jim Milburn]

More common than one thinks.

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