they are for an lt1 and idk y their is the 3 holes in them what are they for cuz i know 1 is for oil

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two olhes are fore vlave cover brkdthers and 1 is fr the p.c.v. ik rther .

 

The passenger side valve cover has a hole for the oil fill tube/cap and one that runs from the TB to the valve cover for the air feed for the PCV system. The driver's side valve cover doesn't have any holes on the stock LT1.

 

I can't see if it has the alternator clearance "dent" but those don't look like LT1 valve covers.