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Had a mishap with bearing 3 so I had to get a new one, my tism got the best of me and decided to remove and buy all of them even though I knew it was a bad idea
Fast forward to my visit to the Chevy dealer, this is what they gave me:
Bearing 1,2,4,5 part #19260875 measures .775"
Bearing 3 part #19260876 measures .775"
Everything I read says 1 and 5 are the same 2 and 4 are the same and 3 is by itself.
For reference the original engine bearing 1,3,5 are .625" and 2,4 are .615"
I'm pretty sure I'm going to ruin some expensive bearings trying to get these in...
Read about 30 posts and couldn't find the info I was looking for.
Are those WIDTH dimensions? Those aren't the dimensions you need to look at.
The important ones are the INSIDE DIAMETER dimensions, which should be-
1 & 5- 2.346"
2 & 4- 2.326"
3 - 2.307"
Are those WIDTH dimensions? Those aren't the dimensions you need to look at.
The important ones are the INSIDE DIAMETER dimensions, which should be-
1 & 5- 2.346"
2 & 4- 2.326"
3 - 2.307"
Well considering they gave me the same bearing for 1,2,4,5 id say they are wrong.
With that being said I measured the ID and got roughly 2.170 on all of them.
Are those WIDTH dimensions? Those aren't the dimensions you need to look at.
The important ones are the INSIDE DIAMETER dimensions, which should be-
1 & 5- 2.346"
2 & 4- 2.326"
3 - 2.307"
ID of the hole in the block, and the OD of the cam bearing, right?
OK, then get the right ones.....
Those .775. .625, and .615 dimensions threw me off....
Get the right ones... What do you think I'm trying to do with this post. I'm trying to figure out what part numbers are the right ones. Considering the dealer says they gave me the right ones...
This is what you want to buy. Summit has them in stock. The 2005ish model year is tricky to buy cam bearings for, because it was the changeover year from first design to second design cam bearings. Actually what the dealer sold you might work, depending on your particular block manufacturer date. Try them first. https://www.summitracing.com/parts/d...SABEgKrMvD_BwE
Last edited by Che70velle; 06-23-2024 at 09:40 AM.
Yeah, those Durabond CH-25 are the ones you want. I actually used them on my 2006 suburban LQ4 DIY-Rebuild a few months ago. They are also wider than the OEM, which is supposed to be a good thing. When you open the box, there are some numbers that tell you where they go. The numbers are actually symmetrical, so 1 & 5 are the same, 2 & 4 are the same, and 3 is unique. I'm going off memory here, so don't quote me on that.
Yeah, those Durabond CH-25 are the ones you want. I actually used them on my 2006 suburban LQ4 DIY-Rebuild a few months ago. They are also wider than the OEM, which is supposed to be a good thing. When you open the box, there are some numbers that tell you where they go. The numbers are actually symmetrical, so 1 & 5 are the same, 2 & 4 are the same, and 3 is unique. I'm going off memory here, so don't quote me on that.
Thanks for the help this is the info I was looking for. The GM ones I got were thick like those new ones but the measurements are wrong. I'll try those ones they look good. The other thing that worried before but not now was the large oil holes but it looks like that's normal.
Do they fit all gen 3 motors, summit says 07+ mine is a 6.0, 05 or 06 not sure which one though as I never had the donor truck
Last edited by 77c10bowtie; 06-23-2024 at 09:01 PM.
The ONLY way to be sure you're getting the right bearings is to know PRECISELY the cam bearing bore inside diameters .
As shown before, 1 and 5 will be largest, followed by 2 and 4 with 3 being the smallest.
The numbers I gave above are for the LATE LS engines.
The EARLIER dimensions are-
1 and 5- 2.326
2 and 4- 2.317
3- 2.307
The ONLY way to be sure you're getting the right bearings is to know PRECISELY the cam bearing bore inside diameters .
As shown before, 1 and 5 will be largest, followed by 2 and 4 with 3 being the smallest.
The numbers I gave above are for the LATE LS engines.
The EARLIER dimensions are-
1 and 5- 2.326
2 and 4- 2.317
3- 2.307
Well considering I posted my question in the gen 3 section and said it was an 06 the early dimensions would have been more helpful to reduce confusion
Not necessarily. You at first stated it was 06 which puts it squarely in the "later" category which covers 03-07
THEN said you weren't sure of the year.
I based putting the later specs up here based on your first post.
It still looks like you need the later bearings.
BTW this all has nothing to do with Gen III vs Gen IV, as all LQ4's are Gen III, and were made thru the 07 model year.
The info I provided on later bearings was correct all along.
Yeah, it's definitely not a Gen III vs Gen IV for the cam bearings, as @G Atsma is saying.
If you don't know or can't verify the year, simply measure them with dial calipers.
For the Durabonds, it's either the CH-10s for the earlier engines and CH-25 for the later engines.
Also note that the bearings have 2 oil lube holes, but the engine block only has 1 lube hole. It doesn't matter which get aligned, just verify it IS aligned. A 90 degree pick works well for this. I mark the bearings with a sharpie on the little beveled edge and eyeball them for the correct clocking, then drive them home, paying attention to center them on the housing bore.
Don't overdrive them. If you do, you can flip the tool and tap them from the other side to center them.
Yeah, it's definitely not a Gen III vs Gen IV for the cam bearings, as @G Atsma is saying.
If you don't know or can't verify the year, simply measure them with dial calipers.
For the Durabonds, it's either the CH-10s for the earlier engines and CH-25 for the later engines.
Also note that the bearings have 2 oil lube holes, but the engine block only has 1 lube hole. It doesn't matter which get aligned, just verify it IS aligned. A 90 degree pick works well for this. I mark the bearings with a sharpie on the little beveled edge and eyeball them for the correct clocking, then drive them home, paying attention to center them on the housing bore.
Don't overdrive them. If you do, you can flip the tool and tap them from the other side to center them.
Good luck 👍
Awesome, thank you very much for the info!
Just to confirm, I can measure the bare cam bores with no bearings to get the numbers im looking for. I know my motor is either an 05 or 06 but I can't be certain. Trying not to order multiple sets and be wrong here.
Awesome, thank you very much for the info!
Just to confirm, I can measure the bare cam bores with no bearings to get the numbers im looking for. I know my motor is either an 05 or 06 but I can't be certain. Trying not to order multiple sets and be wrong here.
Yes. See the previous posts for the dimensions. Measure, don't guess is best.
05 or 06 does not matter. Later bearings went in from 03 onwards as I mentioned above.
If you're sure it's 05 or later, the C-25 bearings are the ones you want.
Or if you're not sure what year it is, measure those cam bores......
Yeah, it's definitely not a Gen III vs Gen IV for the cam bearings, as @G Atsma is saying.
If you don't know or can't verify the year, simply measure them with dial calipers.
For the Durabonds, it's either the CH-10s for the earlier engines and CH-25 for the later engines.
Also note that the bearings have 2 oil lube holes, but the engine block only has 1 lube hole. It doesn't matter which get aligned, just verify it IS aligned. A 90 degree pick works well for this. I mark the bearings with a sharpie on the little beveled edge and eyeball them for the correct clocking, then drive them home, paying attention to center them on the housing bore.
Don't overdrive them. If you do, you can flip the tool and tap them from the other side to center them.
Good luck 👍
I don’t know guys…I’ve never came across a Gen4 engine that needed the early bearings. I realize that Summit has the crossover year as ‘03ish, but I’ve never experienced this firsthand. For me, it’s always been ‘05-‘06 era where the bearings get tricky, unless it’s a gen4 block…which is typically a late ‘05 or an ‘06. Every Gen4 block I’ve ever been in needed the 25 cam bearing. This is what I was getting at back in post #8.
Just a note on the CH-25, they were originally the replacement for around 09- up. But because they worked as a replacement for the CH-23, Durabond superseded them so they don't have to produce and stock so many part numbers. It's the same basic bearing just wider.
As mentioned the CH-10 are basically from the first LS around 98 to around 03ish. Around 04 on the Gen3 Platforum they change the head bolt length and that's when the cam bearings changed. The likely never updated what the CH-25 fit after discontinuing the Ch-23
06-22-2024, 03:00 PM
OEM cam bearing #'s 2006 6.0 lq4 
