pineneedle
Member
My 304 block came back from the machine shop with all the little pipe plugs missing. So, I have a couple of questions. Which hole does the oil sending unit use? The sending unit uses a 1/4 in. Fitting, and there is a 1/4 in. Pipe plug hole toward the rear of the block on the driver's side. I suspect that this is it, but I don't know. Also, there is a 1/4 in. Pipe plug hole on the passenger side of the block toward the front. Is this for a sill-cock to drain coolant from the block? Thanks, pineneedle