valley cover
 

I'm building an 99 LS1 out of a Vette and ordered a valley cover from Billet Specalities because I'm using a carburetor. When it came in it said it would not work on an LS1 it was for a LS2 and 3. Anyone have any idea why it shouldn't work. Thanks, Neil

It will fit, but you have to make a small mod to the block. Look about half way down the page.

http://www.ls1howto.com/index.php?article=18

cover
 

Thanks Bob.