Building a Small Block Chevy: 1985, 305
Page 2 of 82

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When installing core plugs, I coat the hole lightly with green loctite and
then drive them in with an old socket. The loctite makes a good sealer
and it keeps the plug in place. Despite popular belief, core plugs are
not made to push out if the coolant freezes, most of the time they don't!
Use anti-freeze, it cools better and inhibits rust and corrosion.