water temp sender
#2
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drill it out and tap it for the new thread, very easy, very quick, get a tap at local hardware store, use recommended drill and dip it in grease to catch the shavings. I've done it on 2 cars .
#5
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ive also seen the water pump drilled and taped on the top flat round spot.. may be the road i take, lil leary of drilling on brand new prc heads of mine and hoping they dont weep afterward,