Re: Main bearing bolts
The original bolts were a snug fit in the block. You would tighten up the nut, after positioning the cotter pin hole in the bolt for best installation. This snugness is what centers the main cap on the block, there are no dowel pins or other methods to keep the cap in position. The popular grade 8 bolts are looser in the block and do not center the cap. Just something to think about.
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