Outsider25E

Daily driver is a 2004 Yukon XL SLT, with a Z-Code L59 5.3.. ~225k miles, block casting 12567392.

recently broke a lifter roller, ruined the cam lobe.
already have the new cam and lifters (stock), cam bearings were showing some wear, so I decided to go ahead and change them while I had it out. No one had them in stock so I ordered a cheapo set from Amazon.. (silly me, I know).. they came in and didn’t fit. All 5 bearings fell right through the front and rear cam bores. Figured that was just due to the cheap knock off set, so I ordered a set from Sealed Power, part number 1888M, specifically said it should fit my engine. Got them in, and found the same problem. All 5 bearings fall through the front and rear bores with no effort at all.

SO.. my question is.. is there a different set of cam bearings for some LS engines?

Side note: I did wonder if someone had honed the cam bore, but the bearings that came out were stamped “GM” and numbered 1-2-3-2-1 from front to rear. So I’m guessing they’re original.

Gene Cheeseman

There are two different sizes and 2004 was a change-over year.
You probably should get a set for 2006 and up.



Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307 (1999-2003)

Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 (2003-2007)

https://help.summitracing.com/app/answers/detail/a_id/4819

G Atsma

There ARE early and late cam bearings-
1999-03 - Bore 1/5 is 2.326, 2/4 is 2.317, 3 is 2.307
2003-07 - Bore 1/5 is 2.346, 2/4 is 2.326, 3 is 2.307
You need the later set. Note that #3 is the same for both, and early 1/5 is the same as late 2/4.
If ALL fell out, it IS a defective set.
ALWAYS buy from a reputable source.

G Atsma

Quicker on the keyboard, you are.....

Outsider25E

Thanks so much. Hadn’t found that info anywhere.

Outsider25E

Thank you!
All 5 fell out of bores 1 and 5 which is apparently .020” bigger than the biggest of the old set. Makes sense now. Thanks again!

G Atsma

The "old" 1/5 should have fit your 2/4, and the 3's are the same.