The 69 350 block was notched. 69 was the year they made the 350HP rated 350 with 48 heads. I understood they needed the notch to run those 2.11 valve 65.5 cc heads.
I ended up putting some 48s on a low mile 2 barrel 350 I had with those notches. Ran great with 2801 cam. Scrapped the block and wish I had not.
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