Motor drain plugs
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Joined: Mar 2016
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Motor drain plugs
Asking if anyone know the size of the drain plugs for my 1973 302 motor?
I did notice that my drain pkugs are not the same... The treads are pipe (Npt) but asking what size...
Im thinking 1/4th and 3/16th but wanted to check before I go purchae multiple size plugs and then have to return them
Thx
Billy
I did notice that my drain pkugs are not the same... The treads are pipe (Npt) but asking what size...
Im thinking 1/4th and 3/16th but wanted to check before I go purchae multiple size plugs and then have to return them
Thx
Billy
Elder User
Joined: Jun 2015
Posts: 791
Likes: 11
From: Louisville
If they don't require a gasket they are pipe thread. I don't even come close to knowing everything but I do know some engines use pipe threaded plugs but I don't recall any Fords that do - maybe the old gas-fired Super Duty? (401, 477, 534 c.i.) If your's has pipe thread plug(s) it could be someone installed them after stripping the pan threads.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
NAPA shows a '73 Truck motor's plug as a 1/2-20 straight thread.
Drain Plug NOE 7041918 | NAPA Auto Parts
But it sounds like your pan has the front and rear plugs? Isn't that a later model 5.0 thing? NAPA shows those as metric, which may explain why someone used pipe plugs.
Drain Plug NOE 7041036 | NAPA Auto Parts
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