i'm installing crane gold 1.6rr and combination motor sports springs. are my valve covers gong to clear them? i think these are the size height as stock. been years since i installed them? they look like the ebay ones polished but mine have LT1 ingraved into them and painted black. they are bout 3-3.5inches tall.

 

1.6 is bigger then stock which is 1.5. They will fit under the valve covers though.

 

Nope you just need to modify your stockers. Do a search and you should find out what to do and maybe even some pictures.