I just ordered a Fel-Pro gasket set that comes with the "top-hat" style valve seals rather than the "positive seal" type. The part number is HS9292PT1. Looks like a pretty complete set for the top end and should be good for a daily driver rebuild.

 

They changed the seals and seats to a 1 piece in 2001 i believe. 99-00 should have seperate seals and seats.

 

GM part numbers for the valve seals I bought for my 07 LY5. Different for intake and exhaust. These have the shim built in as one piece.

12482062

12482063

 

They're separate on my 99 5.3...not sure what WCCH installed on my 317's though...

 

I just got my springs off and it has the 2 piece seals, I have the one piece since that is what it calls for via my vin #. Think it'll be fine installing the one piece? I took the first two seals off before I realized it, they seem to fit fine thou.

 

Yes, install the 1 piece seals.

 

Haha oh i already did, once i got the springs off i said i'll chance it. Gonna fire it up in the am!!!!

 

I'm guessing you can go from a two-piece seal to a one-piece w/o buying any extra parts. But to go from a one-piece to a two-piece I'm guessing you would have to buy some stock spring seats, which are dirt cheap on LS1tech.

 

Be sure to remove the shims(that used to be under the valve springs).

 

I did remove the old seat, the new ones have the seat built in