I am sorry for this simple question but I'd like a definitive answer before I try to open my radiator's petcock. I have not drained this radiator before. It's a 1966 Coronet Slant Six with the stock 22" radiator. I just can't see which direction the threads are leaning with my bifocal lenses and OLD eyes! The petcock is more than finger tight and I want to go the right direction to open it before I apply a little more pressure on it. The radiator and petcock are in good looking shape. Thank for the help.

Jon

If you lean over the rad, push the right side arm on the petcock down.

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Hyper_pak

So, that would be counter-clockwise if I was under the car looking straight at the petcock? Thank you! I need someone who knows.

Correct. righty/tighty, lefty/ loosey

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170

Just like loosening a bolt. Note that the threads are LH, so it will actually screw into the radiator even though you are turning it counterclockwise (as viewed from aft of the radiator).

Lou

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Thanks folks. I would have guessed LH thread but it's been so long since I've done this I wanted to check. I'm replacing coolant, thermostat, and thermostat housing drilled for secondary temp gauge.

All went well today draining and filling the cooling system. The petcock just took a bit more finger nudging in the right direction and it worked perfectly. Thanks again.

Super. Congrats!

Lou

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