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Old 11-15-2008, 01:27 PM
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Cam tight on insertion

Next question...

I'm installing a new cam in a fresh 454 (468). The cam was sliding in smoothly until it got to the last bearing (at the back of the motor). It will be very difficult to get it to slide in all of the way. Once the cam starts to go into the last bearing, it is very difficult to even turn the cam.

If I get the cam to go in a little further, it requires all of my strength to turn the cam in the hole while trying to turn it by hand with the cam gear installed.

I don't recall the old cam being difficult to remove but that was over a month ago.

Any suggestions or comments would be greatly appretiated.

I'm going to try to re-install the old cam and see if I have the same problem.

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Old 11-15-2008, 01:56 PM
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I recommend spraying the cam bearing with machinist bluing and reinstall the
cam, turn it one revolution and pull the cam so that you can see whats rubbing.
It will be a good idea to remove the bid plug at the rear of the block to open
access to the area. It could be the bearing is installed incorrectly.
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Old 11-15-2008, 02:57 PM
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Scratched Cam Bearing

How bad does this look? Do you think they should be replaced?

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Old 11-15-2008, 03:00 PM
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I re-intalled the old cam and is slides in effortlessly. I can easily turn it with one finger. (Note: the old cam looks to be a re-parkerized, used, cam)

I tried to re-install the new cam with the same rusults.

I also noticed that the front cam bearing seems to have a couple good scratches in it. I'm posting a question on that HERE.
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Old 11-15-2008, 03:22 PM
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Are they all like that?I would change them just to be safe, whats it cost for bearings these days $20, $30 bucks?
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Old 11-15-2008, 03:34 PM
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This is the only one I can see well enought to tell.

Can a shop install new bearings with the bottom end still installed?
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Old 11-15-2008, 03:44 PM
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Yea im pretty sure they can, wouldnt see why they couldn't, Ive always just had bare block though.
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Old 11-15-2008, 05:04 PM
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Definatly make it right... I had mine in the Camaro do the same thing.. I thought.. ahhh... It'll wear in.. Nope.. froze on the camshaft and rode like that for the rest of the year.. didn't cause any damage or problems but sure was a suprize when I took it back apart!
~Scott
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Old 11-15-2008, 07:28 PM
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replace that bearing.
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Old 11-15-2008, 07:34 PM
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Get a new set of bearings and try again.

If they are still tight try using a bearing scrapper (after you slide it in and turn it to highlight the high spots) to loosen the tight bearing or a hone.
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Old 11-15-2008, 08:18 PM
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Get a mirror in there, sounds like you have a burr on the bearing or some dirt binding things up. Have you mic'ed the cam journals? You may have a tapered journal on the new cam. I would check the front bearing real close, they are the most susceptible to damage.

Scotchbrite is what I would use to open up the cam bearing a few 0.0001" if thats necessary.

My guess is you have a bad cam journal or a ding in the front bearing.
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Old 11-15-2008, 08:26 PM
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I merged the two threads for clairity.


From the looks of the picture in the other thread, you may have dinked the back edge of the cam going in and it did the damage when going into the back bearing. Ck the back edge of the cam rear journal for a burr. That scratch looks pretty nasty.
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Old 12-27-2008, 07:51 PM
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Follow Up

Had a reputable shop rebuild the bottom end. They installed all new bearings and rings. I had them balance it also. They had to hone the rear cam bearing (or something like that) to keep the cam from binding.

Thanks for the advice.
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