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Old     (tailgate)      Join Date: Apr 2007       12-09-2009, 8:05 AM Reply   
In TX, I'm planning on riding throughout the winter, but still need to drain my engine after use since I have no electricity in my storage for a heat light... and we do occasionally get below 32 for a while...

when removing the plugs last week, I noticed they were a little scored and roughed up from my wrench and the threads (guess the engine threads were rusty)...

I'm gonna get a wire (gun cleaning) brush and clean the engine threads, try to keep them from rusting more...

Where can I get an extra set of engine drain plugs to have for backup? are they a standard thread size... auto part store, dealer, online...

Also thought about the petcock route, but read about potential rust blockage... so I'll wait on that...
Old     (rallyart)      Join Date: Nov 2006       12-09-2009, 8:08 AM Reply   
Check at a Mercruiser service place. Their plugs are blue plastic butterfly style with an o-ring and may work for other chevy blocks. If they do, you just take them out and put them back by hand.
Old     (tailgate)      Join Date: Apr 2007       12-09-2009, 8:32 AM Reply   
forgot to add its an 08 Indmar assault 325...
Old     (mcook77)      Join Date: Feb 2004       12-09-2009, 8:42 AM Reply   
Go to and search for 3/4 npt pipe plug. Search results will have the plain plugs, t-handle plugs, and well as petcocks.
Old     (chikara22)      Join Date: Oct 2006       12-09-2009, 5:12 PM Reply   
I think Elliot's Hardware in Dallas has them also.
Old     (tailgate)      Join Date: Apr 2007       12-14-2009, 9:29 AM Reply   
Found them at Elliots in Plano...
Old     (tonyv420)      Join Date: Jul 2007       12-14-2009, 1:33 PM Reply   
Dont over tighten the blue butterfly plugs. It just mangles the o ring and then they tend to leak.
Old     (ncollins)      Join Date: Nov 2009       12-28-2009, 11:56 AM Reply   
Here are some plugs that will work for you.

This one is the Mercury drain plug.

This one is the Sierra drain plug.
Old     (slappie)      Join Date: Jan 2004       12-28-2009, 7:10 PM Reply   
Which plugs did you get at Elliots? Did they have the blue butterfly style plugs? If so, I'd like to head out there and pick up a few spares. I always drop those little f'ers in the bilge.
Old     (tailgate)      Join Date: Apr 2007       12-29-2009, 7:27 AM Reply   
no, they had the brass NPT plugs... Im not sure if the blue butterfly plugs would fit in my indmar?


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