67 oil pan drain plug

[Charles H.]

Fist time posting, so not to familar with the site.

My '67 small block oil drain plug is stripped. Does somebody manufacture one with oversized threads or is there another remedy that members suggest (without buying a whole new pan).

Thanks.

[Joe L.]

Re: 67 oil pan drain plug

Fist time posting, so not to familar with the site.

My '67 small block oil drain plug is stripped. Does somebody manufacture one with oversized threads or is there another remedy that members suggest (without buying a whole new pan).

Thanks.

Charles-------


There are a variety of ways to repair this problem which is fairly common. GM used to sell a replacement flange plate under GM #3723008 but it's now discontinued. However, this plate could be easily made using a piece of 5/16" thick flat steel stock and drilling and tapping it for 1/2"-20 thread size. The big problem here is removing the old plate which is spot welded to the inside of the pan.

You might also be able to repair the threads by using a "Thread-Sert" which is available from sources like McMaster-Carr. I've never done this for an oil drain plug but I think it could work very well.

There are also some "self-tapping" oversize drain plugs available. Most auto stores carry these. I don't like them too much, though.

[Edward J.]

Re: 67 oil pan drain plug

Charles, There is truly no easy way to repair, the oversized drain plug is one way, But don't forget any metal that may get removed from jamming a over sized drain plug will be sitting on the bottom of the pan that may not work that great or for a long haul. The correct way is better to remove the pan and drill and install a Helicoil as Joe say's, then you'll be able to clean the bottom of the pan and any metal that is there from the install of the helicoil.