worn cam bearings, fresh rebuild - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 09-05-2014, 09:09 AM Thread Starter
 
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worn cam bearings, fresh rebuild

Y'all may remember me asking all sorts of questions trying to rebuild by 557 cast code 400cui. Well I had finally put it all together, and thought i had done alright. Until i noticed a light ticking sound, which while trying to find the cause i found a cam bearing was starting to come apart. This engine only had 600 miles on it and i used Amsoil SAE 30 break in oil, and i didn't mistreat it.
I am wondering if i just had a stroke of bad luck, or maybe i missed something some where. A shop handled the major rebuild process with the rotating assembly and cam bearing change. I am hoping all i need to do is replace the bearings and choose a new camshaft kit. Can anyone offer advice on what i should inspect or pay close attention before i begin the work?

1971 LeMans 350ci 2Barrel Carb

B. Co 1-22 4ID OIF 2008-09
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post #2 of 3 (permalink) Old 09-05-2014, 10:25 AM
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Did you pull the cam out to see the bearings? Possibly the oil hole in the bearing was not lined up right with the oil hole in the block?? I do believe the motor will have to come out to change the cam bearings.
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post #3 of 3 (permalink) Old 09-07-2014, 12:36 AM Thread Starter
 
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I haven't found the time yet to pull the camshaft. Metal sticking out between the bearing and cam gave away the fact it was coming apart.
I'm almost thinking I may have caused this, I had tightened the roller rocker nuts to factory stamped rocker specs, a move that bent all 16 push rods. Maybe there was enough stress put on the bearings.

1971 LeMans 350ci 2Barrel Carb

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