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Old 11-04-2012, 04:38 PM
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cams

puttin cam bearing in 1970 trans am 455 need to know if there is a certin bearing for each bearing hole .are yhey all the same?

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Old 11-04-2012, 05:21 PM
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The bearings each have a number on the back side. If the numbers are all he same they can be installed in any bore. If not. The box they came in usually has position of each bearing printed on the inside end flap.

I havent done a Pontiac in a while. But, I'll tell you it is not an engine to learn on. The cam bearings in the factory install are bored after install..

The replacement bearings usually require "fitting" of the cam. A bearing knife and Scotchbrite. This can be time consuming.
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Old 11-04-2012, 05:29 PM
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all the numbers on the bearings are the same, there are not any numbers on the box tabs. im not sure thats the reason i was asking
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Old 11-05-2012, 07:28 AM
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Pontiacs use the same bearing in all 5 positions. Not an uncommon question, as most V8s don't (Lima or "385" Ford is another).

Jim
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Old 11-05-2012, 06:34 PM
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Yeah they all the same. Are you asking because one is tight and one is loose. If so its a good chance you need to talk to the machine shop and line bore the block.

Careful installing the cam if this is first pontiac. Make sure engine is in the corect position to install. Rods can get inthe way with 455's. A lot of machine shops insist on installing the cam for this reason. Not hard just got to follow the correct proceedure. Just like everything else. Bigger cams can be more of an issue.

Hope this helps.
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Old 11-06-2012, 08:22 AM
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Never had a cam hit a rod in a Pontiac. What ARE you talking about? NOT a Chevy, you know. The space between the cam and crank is greater than that of a BBC. The standard deck Pontiac (10.240") is .020" TALLER than the "tall deck" BBC (10.220").

Jim
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Old 11-06-2012, 10:01 AM
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Quote:
Originally Posted by Mr. P-Body View Post
Never had a cam hit a rod in a Pontiac. What ARE you talking about? NOT a Chevy, you know. The space between the cam and crank is greater than that of a BBC. The standard deck Pontiac (10.240") is .020" TALLER than the "tall deck" BBC (10.220").

Jim
Yep they hit if the rods are not right. BB Chevy is worse. During install the bearings can hit the rods and nick them up. Makes a failure point on the rod and can lead to failure if running high rpm engine. I didnt have any issues with it but I have seen it done incorrectly and trash a freshly shot peaned rod. You dont have to worry about lobes unless your over 550 lift.
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Old 11-06-2012, 12:22 PM
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Our "package" 461 has a 4.25" stroke and valve lift of .620". Have NEVER seen what you're talking about with anything but a Chevy. This does assume, of course, the rods are installed "forward" and not "backward" (like most non-Pontiac builders do to start with), but even that doesn't cause rod-to-cam interference.

Jim
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