LT1 Engine Build - Small-Block 2.0
In their day, LT1s were known to occasionally spin a rod bearing. According to Golen, the combo of 0.0015- to 0.0018-inch factory bearing clearance and 5W-30 OEM-specified oil wasn't up to forced-induction apps or other hard usage. GES opens up the clearance to 0.0025-0.0030 and specifies 20W-50 Valvoline oil.
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