I got the engine partially torn down. The 13 heads look great. Thick valve margins. No signs of valve recession. Some of the nicest Pontiac heads Ive seen in a while. The block is standard bore 1973 455. I was wrong about it being a 71. I am shocked to see flat top factory cast pistons inside. With all that compression the previous owner must of ran leaded race gas. As you can see from the gunk in the valley area he wasn't too good on the oil change schedule. I will pull the crank out in the next day or two to see how that looks.
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