273 commando Build

Maybe its the block on that side, not the head?

Also…smoke coming from both valve covers???… not running PCV then?
Yeah thanks guys !! that's what it appears like.. warped block .. I check it with a straight edge that last two times the head was off and appeared to be in tolerances. this time it it blew on #2 and 4 again. last time was on #6 .I have another good block to start over with .