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Old 01-02-2004, 01:23 PM
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correctly placed cam bearings

Sorry for the dumb question, but how do you tell if the cam bearings where put in correctly???

Looks like the oil holes are randomly placed.

P.S. 400 sbc

406chevelle

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Old 01-02-2004, 03:27 PM
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Look at the block.
There are oil passages going to the crank, you can see them with the crank and main bearings out, there are oil passages going to the top end, there are different sizes, etc for different engines.

Have a close look down the shaft where the cam bearings go, you should be able to see the holes from the front of the block as well.

If your cam bearings are in the right place, with the oil holes in the right places, they also must be put in squarely or the cam will have difficulty turning with no binding.
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Old 01-02-2004, 05:37 PM
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In all the small block Chevys I"ve built, the cam bores have a groove completely around the inside of the bore, so the oil goes completely around the underside of the cam bearing. From what I can tell, the placement of the hole in the bearing in relation to the bore makes no difference, oil will get to the hole no matter where it is.

Mark
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Old 01-02-2004, 05:53 PM
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But there is a hole in the block that needs to be behind the hole in the cam bearing...?

The groove is 360 degrees, so there will be oil in the groove, but the hole in the block needs to be in line with the actual bearing shell hole, just my .02...?
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Old 01-02-2004, 11:29 PM
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Thanks for the responses Crazy Mopar and Jmark,

Now that it has been pointed out to me I can see how it works, there is a hole that feeds the a groove that goes all the way a round, so it appears that as long as the cam bearing hole are lined up with the groove the cam will get oil.

Thanks again guys!!!!

It is amazing how much I have learned on this build from the people at hotrodders.com

406chevelle
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Old 01-03-2004, 07:27 AM
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Well, after doing some extensive reading on the cam holes, i'll have to say that most say that the bearing hole MUST be lined up with the hole in the block. While I"m not sure why it matters, I'll say do it that way to be safe.

I also found a really interesting article on needle bearing cam bearings.


http://www.hotrod.com/techarticles/69618/

Last edited by Jmark; 01-03-2004 at 07:41 AM.
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Old 01-03-2004, 08:04 AM
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From what I have heard there is a definate correct way to install them. I have always had installed, or installed myself, the bearings with the hole at the bottom. From what I have been told, if they are towards the top, the bearings will tend to pass more oil and not oil as well as well as causing oil pressure fluctuation. All of the spring pressure is pushing down on the cam. If the oil hole is at the top, you can see where oil would be a little hard pressed to get to the bottom of the bearing and that there would be alot more clearance at the top of the bearings than the bottom after the engine wears a little bit. I have als been told the set the holes about 30 degrees to the right of bottom of the bore so that as the cam turns, it will tend to carry oil under as it rotates. The theory there is that if it is on the very bottom, the spring pressures can cause limited oiling by basically sealing off the hole.

I cant tell you which of the above is right, but I would definately not install the bearings hole over half way up on the bore.

Chris
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Old 01-03-2004, 02:15 PM
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That makes sense.

I looked at a BBC today and there is NO groove in the cam bores on this one, so lining up the holes is essential.
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