Are the Felpro LT1 manifold gaskets that I could get form AutoZone the same gaskets that somewhere like Speed Inc. or Thunder Racing would list as header gaskets or are they different?

 

Are they 1470's?! Those are the only Felpro Gaskets that I know of for the LT1's.

 

I don't know if they're the 1470's. Which gaskets are the ones on here I hear about for LT1's, the Felpro 1406's?

I've done a few searches and the 1406's are the ones that everyone says they are using but AutoZone and LS1Speed.com neither one say whether they are 1470's or 1406's.

Does anybody know the difference in the two?