WOW ! Tribal knowledge is disappearing ! At one time, every Pontiac guy knew a SD 455 had a bigger distributor hole in the block to accommodate the larger dist. gear used with the SD 455 cam, and the SD 455 dist. was a standard size dist., but with a factory installed adaptor sleeve to match up with the larger hole in the SD 455 block, which in turn required a larger ID dist. gasket.
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GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION
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