Just a question out of curiosity on cam bearings

[Mopud]

I started building up my stroker today, checking ring gaps, bearing crush etc and noticed the new cam bearings installed for me by my machine shop.

I was intrigued by their design and difference and wanted to know why they were made that way.

The first bearing has a small groove and an oil hole.
The second cam bearing has no groove but an oil hole.
The third has a much wider groove than the first and two cut oil holes except one of them meets the block face and goes nowhere whereas the other one goes through to the oil gallery like the others.
The fourth one is identical to the second.

Does anyone have an explanation of the differences in these bearings and why they are designed so?

Regards,

Mopud

As a side note the machine shop did take my camshaft and checked to make sure it fit right after they'd prepped it and installed the cam bearings.

[Mopud]

Can only attach 3 images

[amcinstaller]

cylinder walls look great, cant speak on the cam bearings though.

[SilverXJ]

I heard the that #3 has the ID groove to provide oil to that second hole. Supposedly there is an older engine that uses oil off that #3 to oil the shaft rockers. I have no idea why #1 has a groove. Maybe to provide more oil to the cam gear.

Your #2 looks kind of beat up.

[Mopud]

I heard the that #3 has the ID groove to provide oil to that second hole. Supposedly there is an older engine that uses oil off that #3 to oil the shaft rockers. I have no idea why #1 has a groove. Maybe to provide more oil to the cam gear.

Your #2 looks kind of beat up.

It does look kind of rough but i assure you they're just scuff marks (it's not scored in anyway), it's in A1 condition.

Thanks for the info and yes I agree the cylinder walls are ace, i'm very pleased with the work!