Red03SillSS Posted July 19, 2010 Report Share Posted July 19, 2010 Went to do a cam swap this weekend and had trouble getting the old cam out. Finally after what seemed like an hour Cody was able to get it out. The 4th journal on the cam, second from the back was black, like the bearing was getting really hot. We took a chance and put the new cam in hoping it would be ok, started it up, and the oil pressure was at 6 maybe 7. So we're pretty sure its a cam bearing. Going to get the motor out this week and look at my options. You can see where this lobe was excessively worn. Cam has 30k on it. Maybe a bearing in the lifter? Or To much spring pressure? Running Patriot Duals. This is the only lobe with wear like this. Quote Link to comment Share on other sites More sharing options...
tonycillo Posted July 19, 2010 Report Share Posted July 19, 2010 o man that is never any good. i had to mod my driver header a little to get it to clear the front drive shaft. Quote Link to comment Share on other sites More sharing options...
Red03SillSS Posted July 19, 2010 Author Report Share Posted July 19, 2010 o man that is never any good. i had to mod my driver header a little to get it to clear the front drive shaft. Mod it for what? I'm pulling the motor and if the header does lean far enough for the motor to come ill take the driveshaft out. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted July 19, 2010 Report Share Posted July 19, 2010 Sorry to see/hear the news, which cam were you running just out of curiosity? Look at it this way, you can build the valvetrain bulletproof now..... Quote Link to comment Share on other sites More sharing options...
Red03SillSS Posted July 19, 2010 Author Report Share Posted July 19, 2010 I was running a 216/220 .586 .586 114. Yeah I'm building it the way I want to since it be out. It's going to be stout. New cam is 224/228 .581 .588 110 lsa Quote Link to comment Share on other sites More sharing options...
black00chev Posted July 20, 2010 Report Share Posted July 20, 2010 Why after seeing the old cam like that did you put a new one in? Quote Link to comment Share on other sites More sharing options...
Red03SillSS Posted July 21, 2010 Author Report Share Posted July 21, 2010 Why after seeing the old cam like that did you put a new one in? I never said anything about driving it with the new cam. Quote Link to comment Share on other sites More sharing options...
smoothdime Posted July 23, 2010 Report Share Posted July 23, 2010 I never said anything about driving it with the new cam. driving on it or not. why risk damaging the new cam? well looks like its time to upgrade. good luck. gary Quote Link to comment Share on other sites More sharing options...
tonycillo Posted August 20, 2010 Report Share Posted August 20, 2010 i just heated the header up and had to put a little force on it moved it out like a inch. i had to drop front drive shaft was not hard to do. just a pain. Quote Link to comment Share on other sites More sharing options...
Krambo Posted August 20, 2010 Report Share Posted August 20, 2010 Ouch. Sucks for sure however this is now a good opportunity to add some better parts like Fireman said. Quote Link to comment Share on other sites More sharing options...
slowfive0 Posted September 14, 2010 Report Share Posted September 14, 2010 Not sure if this will help you as I'm replying late, but my machinist has seen a few of these engines with this problem. I'm 99% sure mine has the same problem (oil pressure dropped one night after a little bit of play) ;-D. Anyways iirc, he said around mid 2004, GM changed the cam bearing part #. Basically, the newer cam bearings have a larger OD. Consequently, he has been able to machine the cam bore out to fit the newer bearings rather than scrapping the block. His thinking is that there wasn't enough crush designed into it from the factory or some other weird issue and that they resolved it with the new design. Hope this helps----good luck!!! Quote Link to comment Share on other sites More sharing options...
detjoe Posted September 14, 2010 Report Share Posted September 14, 2010 Not sure if this will help you as I'm replying late, but my machinist has seen a few of these engines with this problem. I'm 99% sure mine has the same problem (oil pressure dropped one night after a little bit of play) ;-D. Anyways iirc, he said around mid 2004, GM changed the cam bearing part #. Basically, the newer cam bearings have a larger OD. Consequently, he has been able to machine the cam bore out to fit the newer bearings rather than scrapping the block. His thinking is that there wasn't enough crush designed into it from the factory or some other weird issue and that they resolved it with the new design. Hope this helps----good luck!!! so your truck is still making noise? I thought it was a cat? I hoped it was a cat... Quote Link to comment Share on other sites More sharing options...
misterp Posted September 14, 2010 Report Share Posted September 14, 2010 Sorry to hear about this, that totally blows. Mr. P. Quote Link to comment Share on other sites More sharing options...
slowfive0 Posted September 14, 2010 Report Share Posted September 14, 2010 No, my issue with the cam bearing happened late last winter and I've put 15-20,000 miles on it since. There is a tad more valvetrain noise (ever so slight), but nothing really obvious. My knock was/is the catalytic converter which is causing a severe exhaust restriction. I'm still driving it unfortunately for now. I'm in the process of figuring out what exhaust I'm going to run. Right now, I have (2) 3" catalytic converters (Magnaflow) and a set of pacesetter headers with the v-bands welded on. They are 1 3/4". My plan is the run 3" from them to an x-pipe, then dual mufflers and finally out the right rear with a pair of 3 1/2" tips from Magnaflow. The muffler is the only question mark right now. Must be fairly quiet so that narrows my choices a lot. I am leaning towards some huge magnaflows, or maybe flowmasters or even possibly some edelbrocks. Considered Dynomax too. Basically, I have no clue which muffler I'm going to run....LOL!!! Sorry to hijack this thread and thanks for the concern. so your truck is still making noise? I thought it was a cat? I hoped it was a cat... Sorry to hear about this, that totally blows. Mr. P. Quote Link to comment Share on other sites More sharing options...
ss454327 Posted September 14, 2010 Report Share Posted September 14, 2010 No, my issue with the cam bearing happened late last winter and I've put 15-20,000 miles on it since. There is a tad more valvetrain noise (ever so slight), but nothing really obvious. My knock was/is the catalytic converter which is causing a severe exhaust restriction. I'm still driving it unfortunately for now. I'm in the process of figuring out what exhaust I'm going to run. Right now, I have (2) 3" catalytic converters (Magnaflow) and a set of pacesetter headers with the v-bands welded on. They are 1 3/4". My plan is the run 3" from them to an x-pipe, then dual mufflers and finally out the right rear with a pair of 3 1/2" tips from Magnaflow. The muffler is the only question mark right now. Must be fairly quiet so that narrows my choices a lot. I am leaning towards some huge magnaflows, or maybe flowmasters or even possibly some edelbrocks. Considered Dynomax too. Basically, I have no clue which muffler I'm going to run....LOL!!! Sorry to hijack this thread and thanks for the concern. There is a thread on LS1tech where they directly compared a bunch of mufflers on an engine dyno back to back and the Hooker Maxflow were the 3rd most power (less than 1hp difference) and the 2nd quitest behind the Borlas. I'm running one on my truck and even with no cats, ARH LT headers, dual 3" Yd into single 4" and a single 4" Hooker Maxflow dumped in front of the axle it's quieter than the stock setup with a drop in Flowmaster. Now at WOT this baby SCREAMS but under 4krpm it's deep and smooth. Quote Link to comment Share on other sites More sharing options...
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