Cam bushings

[getblown5.9]

I've searched and searched, and no threads actually give any specs.

What I've found is when you line bore for cam bushings, you are installing a modified rear journal bushing from a CR.

What does the bore need to be, is it the same as the front journal that already uses a bushing or is it something different?

 

[nborga87]

We used a bushing that was thicker than the front one. I got the part through cummins and i have the part number laying around and ill put it up when i find it. They had to cut a lot out of the block something like .120

 

[nborga87]

cummins pn 3940059

 

[ILLINOISRAM]

I have been told to just use the factory ones and then Scheid uses some different ones so it is alittle confusing.

 

[getblown5.9]

I know, and its hard to get a straight answer on this. My machinist needs to know what to bore it out to so he can make sure he has the right tooling. I originally told him to make it just match the front journal, but now I am not too sure.

 

[kleann]

I know, and its hard to get a straight answer on this. My machinist needs to know what to bore it out to so he can make sure he has the right tooling. I originally told him to make it just match the front journal, but now I am not too sure.

Who's doing the cam, they oughta be able to tell you.

 

[ILLINOISRAM]

Hamilton said make it match the front one. Scheid uses a thicker and thinner width one for the others. That's what I have come up with so far.

 

[Tony R]

You use the stock ones but have to turn them down to different widths.

 

[nborga87]

who are you getting to do the machine work tj?

 

[01silver bullet]

I haven't heard of any one doing this, I left mine alone, is this a popular thing? I can't see much of a benefit... Would not be fun installing that bushing!

 

[DISTURBED]

I haven't heard of any one doing this, I left mine alone, is this a popular thing? I can't see much of a benefit... Would not be fun installing that bushing!

You have to have them to run a billet cam

 

[getblown5.9]

who are you getting to do the machine work tj?

Thompson Machine, a local mopar/dodge fanatic, his shop is filled with nothing but 318, 360, 440, hemi's etc.

 

[JerrodGlover]

You have to have them to run a billet cam

I have ran a Billet cam for several seasons with no problem and no bushings.

 

[ILLINOISRAM]

It depends on the ramp rates and spring pressure plus the obvious lubrication quality.

 

[BluegrassDiesel]

I have ran a Billet cam for several seasons with no problem and no bushings.

How many RPM? If you're going to sink several thousand dollars into building an engine, I wouldn't get skimpy when it comes to cam bearings.

 

[JerrodGlover]

Low RPM only around 5k

 

[zstroken]

How many RPM? If you're going to sink several thousand dollars into building an engine, I wouldn't get skimpy when it comes to cam bearings.

Jerrod windows blocks before he wears the cam journals out. There are several folks who run billet cams without cam bushings though.