302 engine block drain plug/freeze plug...???

Discussion in 'Technical' started by mean_maverick, Jul 4, 2006.

  1. mean_maverick

    mean_maverick Senior Member

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    i kept noticing a slight amount of coolant gone from the radiator after a couple of days of sitting, well since im off for the 4th i thought i would just get outside and enjoy the day tinkering with the car. well, i found out where the water was going....(and i also think this is the main part of my overheating problem)

    there's a hole on the driver's side of the block, near the back that was leaking. i took my header off of that side and put a small screwdriver in it and all kinds of 'gunk' came out. i cleaned the hole out ad everything and i went to put a 1/2" freeze plug in it only to notice that it didnt fit right. so i thought it might have been a threaded hole so i tried a threaded plug... no luck. it doesnt look like there are any threads in the hole.

    so here's my question, does anyone on here know if this is a threaded or non-threaded hole. and maybe what size plug i need to get for it...? any help on this matter would be greatly appreciated:bowdown:
    Last edited: May 17, 2007
  2. igo1090

    igo1090 Member

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    not threaded. did u get out all of the old freeze plug? hole must be clean. go get a rubber expansion type plug u put it in the hole and tighten the nut to expand the rubber plug. i forget if u need 1 1/2 or 1 5/8 inch size. these are much easier than trying to drive in a freeze plug in a cramped space. ive had 1 in my motor for 3 yrs now
  3. RegL404

    RegL404 Member

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    That hole to the right of the brass freeze plug looks like a block drain. I think it is supposed to be 1/4" pipe thread.
  4. 71gold

    71gold Frank Cooper Supporting Member

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    why do the pics. have an 8/01/2005 date :huh: ...frank...:bouncy:
  5. mean_maverick

    mean_maverick Senior Member

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    i've never set the date one the camera:slap: .... and yes, im referring to the small hole in the pictures BESIDE of the brass freeze plug.
  6. MNTony

    MNTony aka Stinky

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    That hole is threaded in my block and has a pipe plug in it. Not sure why yours doesn't look that way? The rubber expansion plug may not be a bad idea if you can find one the correct size. Good luck!
  7. igo1090

    igo1090 Member

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    sorry. thought u meant the freeze plug hole. drain hole is usually 1/4 npt. try a cleanout tap and a new plug.

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