Chevy SB valve covers question...

What years did Chevrolet put their "Chevrolet" script valve covers on small blocks? I have a pile of valve covers, some script, some just flat(sorry, none with "corvette'') and I'm curious which years these would be 'correct' for.

 

I'm not sure but the 265's and 283's had them and the 327's didn't.....

 

If they have staggered bolt holes, they're '55 through mid-'59 vintage...If that helps at all.

 

'55 through '67.