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Old 04-15-2006, 10:15 PM
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Lifter Problems/Head Problems

A few problems for the 350 in my 67 Chevelle. Valve problems in the heads have forced me to have them rebuilt. Oh the joys. Any how I noticed today that a lifter had come apart for the second time since I had the motor built. And for some reason perhaps just luck it was on the same side of the motor as the last one that came apart. This time it happened on a different valve. Does anyone have any idea why this happens? I would really hate to get the heads back and put everything back together just so that this could happen again. If anyone has any insight to this problem please let me know. The other question I had was about roller lifters. Right now I am using a hydraulic cam with hydraulic flat lifters. Would I have to change my cam if I wanted to use hydraulic roller lifters? Thanks in advance.

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Old 04-15-2006, 10:35 PM
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You would have to change to a roller cam. I believe their lobes are hardened and their ramp style is different (normally steeper for the given duration of a cam).
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Old 04-16-2006, 05:46 AM
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Roller lifters takes a roller cam. Roller rockers don't. Why would your lifter come apart twice unless the mechanic is pulling them apart for some reason before installation and not putting them back together right. If not, then I would change brands of lifters and go with a brand name if you are now using an off brand. I could see it happening once, as maybe a factory reject, twice and it sounds like some Chinese knockoffs. And when you say it comes is coming completely apart as to where the internals or coming out? If that is the case, then it sound as if something is not compatable with something else. Even if the top snap ring came out of the lifter, the pressure from the valve spring to the rocker, to the pushrod, should keep the guts in the lifter. If the guts come out, then there is a length problem somewhere. Are your studs remaining in the head, or are they starting to pull out. (screw in studs vs. press in studs)

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Old 04-16-2006, 07:37 AM
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The reason most hyd. lifters come apart is because of what some call "floating the valves" when actualy they are floating the lifters... Revving it to high for what the valve train will support...

Not to say you may possibly have had a defective lifter but twice...?

Also the hyd. roller question had been answered...
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Old 04-16-2006, 01:47 PM
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Kevin....I had pressed studs but right no the heads are in the shop getting rebuilt. I will have screw in studs with guide plates for the push rods. The lifters are from crane just as the cam is. They are suppose to float at 7 grand and I have never had the motor at that high of speed. Hopefully after the rebuild these problems will go away and the motor will run like it did when it was first built. As for the roller cam question thanks for the reply from everyone....guess I will be sticking with the hydraulic cam with flat lifters for now.....perhaps later or on the next motor I will go with the roller cam and lifters. I will keep you all posted on my luck with the rebuilt top end.
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