If the short block is a fresh build, it could be excessively tight, causing it to run hotter than normal due to increased friction. If it was redone, how much were the cylinders bored?
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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