Re: '63 Fenderside in Colorado
I wouldn't know if there is one main bearing over anther that has critical wear or not. (e.g. '80s GM v6 center crank bearing was the critical one due to oil starvation.) Wile oil pan is off remove a bearing cap, use a piece of Plasti-gauge on both the crank and at least one piston connecting rod (secure piston so it doesn't drop when the bearing cap is removed). A visual inspection of the condition and the Plasti-gauge results will tell you.
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