from what i read one is for a high performance block and the other is for the non high performance block. meaning one is for 2 bolt one is for 4 bolt. Mine is a 2 bolt. I am going to see if the hardware store near me has them Might give me a reason to work on the car today since I have nothing new coming in..lol
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2005 dodge magnum daily driver
1988 mazda rx7 LS6 swap
1969 SS work in progress
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