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Old 01-19-2003, 03:30 PM
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Post could be a bad problem...??

let me see what yall think.... i have a 350 with 993 heads. .480 lift cam. and regular 1.5 rockers just yesterday 2 of my rocker arms were very loose and tapping bad, so i tightened them down and double nutted the nutts so it would be harder to back off. but they started tapping again and became very loose and not much lift . i thought at first it was a "wiped" cam the lobes were wiped but i am not sure now.with the engine running i adjusted the vavles stopped tapping on one then started tapping again so i did a 1/4 round more stopped tapping then tapping again... no mattter what i do it taps all the lifters are good pushrods are strait, no valves sticking nothing like that i just cant figure it out. theres 2 valves that isnt getting much lift as comarped to all the others and the rocker arm is tightened almost all the way down the the end of the threads and is still loose. do you have any ideas? please tell me

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Old 01-19-2003, 03:38 PM
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Maybe a couple of studs are pulling out.
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Old 01-19-2003, 03:39 PM
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Make sure you don't have any bent pushrods also.
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Old 01-19-2003, 03:43 PM
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Sounds like studs are pulling out to me.
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Old 01-19-2003, 03:46 PM
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hydrolic, or solid lifters??
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Old 01-19-2003, 05:35 PM
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they are hydraulic lifters, but i know the problem now, i checked every stud, they all have the same height, push rods are all strait, but its the camshaft 3 of the cam lobes are worn down "wiped" so now i have to do a camshaft change. the motor is only 5 months old too. What could make this happen?
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Old 01-19-2003, 06:36 PM
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This will usually happen if you didn't take the time to break-in your cam.
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Old 01-19-2003, 06:51 PM
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I've never done the cam breakin and have never had a prob.Not that thats the right way though.
One question for you is,was it a comp cam and did you use that red lube they supply.The reason I ask is I'm getting ready to pull mine back apart cause that sh#t is so thin.I'm gonna call comp tommarow.I'm starting to think I shoulda stuck with the cheapo mass produced cams(summit,PAW,clevite)theve allways done me good.
Read my post "Cam lube the graphite stuff vs. the red stuff"its a page back now.
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Old 01-19-2003, 07:02 PM
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if the rocker arm nut is bad (easy to turn) and backs of the lifter can bounce around in between the lobe and the push rod and acualy beat the cam lobe flat. I've seen stock rocker nuts destroy several camshafts. always double nut or use polly locks (extra security is always nice). just some advice.
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