I need Help finding out what this thread is on the block.

[chicos240]

I have a missing coolant plug on the driver side of the block. What thread is that? I need to plug it.This a 95 s14 SR20DET

[duffman1278]

I'm not sure but too me it looks like a M12 and threading would probably be 1.25 That's pretty common around the 240's.

But i'm not 100% sure. If you don't have any luck here and need it fast. My suggest to you would be to get a few bolts from the hardware store. Just find out the size. Test like a M14, M12, and M10 and the thread is more than likely 1.25 or 1. I'd put my money on 1.25 though

[chicos240]

Unfortunately, its more like a 16mm and quite possibly a metric NPT?I dont know...im getting frustrated...Nothing fits.