99Silver6.0

iTrader: (1)

Im making sure I have all my stuff to get my cam in. I did not think to order a frikkin o-ring for my new oil pump with the rest of my parts. Where I am using an LS6 oil pump is there a different o-ring to use? I cant find the part number for the correct o-ring. Anybody have it??

one03sierra

iTrader: (1)

1 2 5 6 3 9 6 3 . :d

99Silver6.0

iTrader: (1)

Ok, this is what that part # brings up on GMParts.

GM PART # 12563963
CATEGORY: Engine Oil Pump Cover Seal
PACK QTY: 5 CORE CHARGE: $0.00
GM LIST: $4.40
OUR PRICE: $2.51
DESCRIPTION: SEAL

That right?

bmbutler

Your local Chevy should have all in stock.
You'll need valve cover gaskets....front cover gasket......front crank pulley seal......and you'll also need the oil pick-up tube o-ring if you are planning on changing the timing chain and/or oil pump.

BenKey

iTrader: (1)

You don't need valve cover gaskets. The valve covers have embedded gaskets.

03-25HD

12563963 is o ring for 5.3. LS6 o ring is 12557752.

bmbutler

That's odd, mine were not embedded? I put new gaskets when I changed them. Just did the cam swap last weekend.

99Silver6.0

iTrader: (1)

Ok, so since I got the LS6 pump I need the o-ring for the LS6 and not the 5.3 correct?

BmButler,

I have all my parts except for the pump o-ring. I didnt get valve cover gaskets because they can be reused a limited number of times.