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Author Topic:   cam problems
limitedmod45d
Member
posted April 17, 2003 11:58 PM
traded a stock 350 for 383 that they couldnt git rid of a miss. We tore it down and no lobes on the cam we redid it put it together with a new cam and lifters cranked it and the valves started getting loose and werent backing off. So we figured it was doing the same thing wearing the cam out we thought the valve springs were too strong so we changed heads and looked at the lifters they werernt in good shape so we changed them too every thing seemed ok nothin backed off then we took it to the track and as soon as i mashed the gas it just went down started missin and wouldnt run got hot so i came off and all the valves were loose but werent backing off we reset the valves and skipped the heat ran 2 laps in the feature just to get money never gased it and it did it again has ok oil pres. any ideas would be helpful


#28
Member
posted April 18, 2003 06:10 AM
Hard to tell from your post the exact sequence of things, but if at any time you had used lifters on a new cam, or new lifters on a used cam, odds are good that things were ruined right away. Every time one of my engines has wiped a lobe, bearings have also suffered from all the crud. Others will argue against this, but if you are having this problem, you obviously need more lube in this area, so I would advise getting rid of any restrictors. If you do have your lifter bores corrected or bushed, examine the guy's tooling. Our local yayhoo was "correcting" our lifters with some ending up over 1/16" out of position, due to ancient, battered tooling. Talk about cam and lifter problems for 3 years! Did not find this out until I bucked up for a Lifter-Tru to do it myself.


limitedmod45d
Member
posted April 18, 2003 10:29 AM
thanks we talked to our engine builder and it is the lifter bores. we had a new cam and lifters in it at first then when we pulled the heads the lifters werent in good shape so we changed them too


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