Then on setup, if they did not have plastigage back then --maybe they did --- how did they determine where, how much to shim each main bearing cap. On this 261, it looks like they just replaced the main and rod bearings standard size and placed the cap shims on the mains where they were prior. As I understand this engine stopped running after 6 miles. Engine is not seized but rod bearings are solidly into the copper and the mains are very grooved along twith the crank.. I do not know yet if .020 will clean up the crank or not yet. I believe the mains clearances is what eventually stopped the engine. I have an old engine rebuilder close I will get to check the crank.


1959 GMC 100 Fleet
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