Ferocity02

iTrader: (59)

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.

black04

iTrader: (15)

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

Mrgoodwrench3

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

budhayes3

iTrader: (19)

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

carolinaz71

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.

GMCtrk

iTrader: (27)

Yes, install the 1 piece seals.

carolinaz71

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

Ferocity02

iTrader: (59)

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.

AKlowriderZ71

iTrader: (22)

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

carolinaz71

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