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Discussion Starter · #1 ·
I have a 97 gmc med duty truck that im replacing the weak 366 w a 427.
366 was one pc rear main, the 427 i bought is an earlier 2 pc rear main block.
Finding a later model one pc rear main 427 is like pulling teeth! noticed there is not a center of block port in older block for the knock sensor (obviously b/c those years Didnt have a knock sensor). Can i relocate it to the port at the bottom of the block near oil pan? Or do i even need to worry about having one? What would it do/run like w/o it? Can anyone help me? Need this truck back on the rd asap.
 
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