1973 Dart 318 core plug replacement questions

Lasalle said

The core plug on the right/passenger side rear next to the oil filter is leaking. Questions:
1. Can this be replaced with the engine in the car?
2. Should I get a steel or brass replacement?
3. What size is correct?
4. Should I use sealer? If so what kind?
5. Will any auto parts store have this part or will I have to order it somewhere?

Thank you, Tom

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1. Yes
2. Brass
3. Get a kit
4. Yes. I like CopperCoat, but, Permatex, rubber cement, or even paint will probably work ok if the hole is clean and smooth.
5. They should all have them individually, but, a kit might have to be ordered.
6. If all your freeze plugs are steel, do yourself a favor and change them all. It's a big, messy job on a small block since you have to pull the transmission to get the rear ones, but, in the long run it will save time, money and agravation.......not to mention possibly saving an engine from overheating. Flushing out the block of rust and debris is probably the messiest job you will ever do.