Engine block coolant drain plugs 340

[jcmeyer5]

I am so sorry for this mundane question, but I need to know what size the plugs are for the coolant drains in the block (so I can order new). I tapped them out already, but damned if I cant remember if it was 1/4 or 3/8 NPT. I searched and searched and havent found it on the interwebz and I am nowhere near the engine. Thanks.

 

[krazykuda]

I believe that they are 1/4" npt...

 

[Dana67Dart]

My dad installed drain plugs like on the radiator, in my mind's eye they are the same size.

 

[gzig5]

The ones on either side of the lower block area? I just had those out this weekend. I was going to say bigger but I just went and pulled one and checked against a tap. They are 1/4" NPT.

 

[halifaxhops]

I use petcocks makes it way easier to drain once a year to get the crap out.

 

[Wyrmrider]

with my luck the crap plugs up the butterfly valve petcocks

 

[jcmeyer5]

Thanks everyone! Does anyone by chance know the port sizes in the water pump? I think one is 1/2 NPT and the other is 3/4 NPT, but again, no way to measure them.