sbc350 that eats cam lobes - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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  #16 (permalink)  
Old 06-11-2002, 02:10 PM
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dont have a clue what's causing this but i don't think you have to. you said a quality shop did the machine work on the heads. that means you take the heads right back there and have them do all the explaining or you shove them done their throats.

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  #17 (permalink)  
Old 06-11-2002, 02:23 PM
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I had the same problem with a comp cam, and I also followed the breakin to a T. I was told by a guy at the local rod shop that he also went thruogh 3 comp cams with the same outcome. Don't know for sure but I heard comp cams is farming out thier grind work and quality control is suffering. My solution was to boycott comp cams and switch to Isky. Comp cams had poor customer service. They would replace the cam for me but offered no reason for the failer. Thier attitude seemed like they get flat cam calls all day long. Call Isky and you'll get someone who really wants to help with all your cam troubles. No I don't have stock or work for Isky, but thier cam works good for me.
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Old 06-11-2002, 08:14 PM
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E, I don't know what your problem is, but I had a similar problem on my 355 Chevy. It ate 2 hydraulic cams. I went with a 280/290 solid lift cam (.520-.521) (2500-7000 RPM) from Herbert Performance, and have run it over a year now without any problems (that includes over 200 passes at the strip). Never did figure out what the problem was with using the hydraulic cams.
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Old 06-12-2002, 11:12 AM
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lots of good ideas.anyway run the engine with out a valve cover,make sure push rods are rotateing,and oil is coming up,i think if you had a binding problem,push rods would go first.cam walk is a possibility,check your chain cover.good luck.
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Old 06-12-2002, 11:46 AM
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With 1.6 Rocker arms you are running into coil bind.Clay your pistons and make sure you have plenty of piston to valve clearance - .080 to .100 on the exhaust valve. The intake valves should never hit - piston is going down as the valve is opening. When the exhaust valve is all the way open you should be able to put a .050 feeler gauge between the coils in the springs. Check the installed height of the valve springs.Measure from the bottom of the spring pocket to under side of the valve spring retainer, where the top of the spring rides.
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Old 06-15-2002, 10:49 AM
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hi as i have experianced this myself.i suggest you might have the same problem, after having my engine eat 3 cams i had my lifter bores checked they were out.i tossed the engine only to get another block with lifter bores out of aliment,not by little but heaps.i had kept the old lifters in order to referance back .put new rings,bearings,cam and lifters and run in as per usual proper cam manufacturs recomendations.60 miles and cam was for the scrp heap .so i checked the old with new lifters and they correspond with marks in old lifters.so i had the block lifter trued and now is fine.hope this is of some help.
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