Which Oil Pump O-Ring?

[Rick_Vor]

I picked up what I thought was the correct Blue Oil Pump O-Ring 12557752 from the Dealership for a 1999 Silverado oil pump pickup tube for my forged 370 build. Once I got home I noticed my pickup tube had a recessed channel with a red stripe for the O-Ring. Should I be using the Red O-Ring on this pickup tube? GM Oil Pick-Up Tube O-Ring (1st Design) 12557752 BLUE SEAL Specifics: * Oil Pick-Up Tube O-Ring ea. * Chevy/GMC Pick-Up (1999-2000 LS V8) 1st design * F-Body (1998-2002) * Cadillac CTS-V (2004-2007) * Corvette (1997-2008) * Thickness = 3.55mm (0.140") ID = 23.60mm (0.930") GM Oil Pick-Up Tube O-Ring (2nd Design) 12584922 RED SEAL Specifics: * Oil Pick-Up Tube O-Ring ea. * Chevy/GMC Pick-Up (1999-2000 LS V8 engines with 2nd design pick-up tube) * Trailblazer (2003-2008 With LS V8 engine) * Hummer H2 (2003-2008) * Hummer H3 (2008 With LS V8 engine) * Chevy/GMC Pick-Up (2001-2008 LS V8 engines) * W- Body (2006-2008 With LS V8 engine - Impala, Lacrosse, Grand Prix) * Thickness = 4.20mm (0.165") ID = 20.69mm (0.815") Specs lifted from a posting by 69LT1Bird. :-) Thanks, Rick

[-Joseph-]

Yes you need the thicker o-ring for the recessed groove like that.

Most trucks also use that style, looks like a truck pickup tube also.

[Rick_Vor]

Yeah, it's from a 1999 Silverado and the 370 is going in my 2005 Sierra.

[MillsMotorvation]

I also was thinking, I got a oil pan kit from Summit, and the O-ring is Blue that came with the pan, and the O-ring that came in the stock pump(2002 LQ4) is red, will this cause a oiling problem? Also Im getting a new oil pump for the LQ4 will I need a new O-ring?

[69LT1Bird]

You match the pickup tube to the O-ring. The oil pump bore is the same.

[MillsMotorvation]

Ok, so Im good, thanks.

[tiresmokinV8]

Sorry for bringing back an older thread but before I install the pan on a engine Im swapping into my truck I want to replace the oring. I picked up a oilpan and pickup tube off a new crate ls3 and it has a red o-ring on it. According to the chart above the vette should have the blue even though it only goes up to 08 but I thought the ls3 pans were the same as the ls2 ones. It came with a red oring and has an indent so Im pretty sure that it calls for a red one. The pan is going onto a ly6 which also had a red oring on the stock pickup tube, eventhough the oring is depedant on tube.