Doc Hawk Posted July 21, 2008 Share Posted July 21, 2008 I'm concerned that the engine I just dropped in my Z might have a solid cam, while the cam towers are an internally oiled setup. It's an A-grind cam. When the motor is running, I am getting a "chirp" squeal/squeak from the #5/#6 area, up high in the motor either in the cam or in the valvetrain. It squeaks once per revolution and it is most apparent at idle. How can I tell if the cam is drilled for oiling? If it is indeed a solid cam, can a cam be drilled for oil, or should I just get another cam? Lastly, if replacement, what stock grind should I look for to get the most streetable power? I guess the other option is switching out the cam towers to a spraybar setup. Would that work as a drop-in swap? Thanks, David Quote Link to comment Share on other sites More sharing options...
naviathan Posted July 21, 2008 Share Posted July 21, 2008 If it's drilled for internal oiling there will be small holes in the nose of each of the lobes. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted July 21, 2008 Share Posted July 21, 2008 I guess the other option is switching out the cam towers to a spraybar setup. Would that work as a drop-in swap? Yes, just make sure the cam rotates freely after the new towers are bolted down. Quote Link to comment Share on other sites More sharing options...
Doc Hawk Posted July 21, 2008 Author Share Posted July 21, 2008 Thanks Jon. After a bunch of Searchie, I like the spraybar mo'better anyway, so I'll go with that and keep the A-grind solid cam. I believe the A grind has the best durations for a stock cam (opinions to the contrary welcome). Quote Link to comment Share on other sites More sharing options...
naviathan Posted July 21, 2008 Share Posted July 21, 2008 C grind is actually the "best" by popular vote if you're sticking with stock cams. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted July 21, 2008 Share Posted July 21, 2008 C grind is actually the "best" by popular vote if you're sticking with stock cams. All of the stock cams are puny. C grind is so slightly different than the others that I seriously doubt a dyno would show a difference outside of it's margin of error. Quote Link to comment Share on other sites More sharing options...
naviathan Posted July 21, 2008 Share Posted July 21, 2008 All of the stock cams are puny. C grind is so slightly different than the others that I seriously doubt a dyno would show a difference outside of it's margin of error. I know, I was simply sticking to stock grinds as the thread was pertaining to them. Quote Link to comment Share on other sites More sharing options...
katman Posted July 21, 2008 Share Posted July 21, 2008 Besides the fact that just about every letter of the alphabet has been on the back of stock Z cams, The alleged "A" grind, if its old, could be either an L24 cam (externally oiled) or from an L28 (internally oiled). If you buy one new it will be internally oiled. Quote Link to comment Share on other sites More sharing options...
Doc Hawk Posted July 22, 2008 Author Share Posted July 22, 2008 My racing class for this build only allows stock cams, so I'm stuck with 'em. Thanks for the input on the grinds; from the sound of it there just isn't enough difference to go to much trouble swapping cams for a different stock grind. Quote Link to comment Share on other sites More sharing options...
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