What u are asking about is on older ls engines, mostly truck engines the 3rd or 4th bolt from the back on the driver side was never drilled from the factory. It never cause any leak issues on factory pans, but i do not know about after market pans. I will check my blocks i have here and try and find an example of such
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1960 Chevy C10 Apache
1969 Chevy Nova
2007 Chevy TBSS
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