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I have a 69 350 (Vette) motor in the 59 and I need to know what the thread size of the temp switch hole in the head is.
I think that it is 1/2" BSP but am not sure.
I know that I could take out the old one and get the size but I don't want to dump the coolant in case the local guys don't have the correct size and then I'll have to waste another fill.