Cam break in procedure
#21
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it turns out the lifter on the #1 intake valve broke in half.....anyone ever hear of this before??? what causes it???
#22
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454 I had a lifter break on me last year the bottom of the lifter had a small groove like the old GM lifters did and I started the engine and heard a snap noise pulled the valve cover off and found a loose rocker pulled the intake and the piece under the groove had broke off. Comp told me to eat it . Any lifter you use you can check on a surface plate for crown and rockwell. If you need these numbers I've got them . Best of luck Laz Mesa
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Good luck in future. Ruben's racing came in CA has really good lifter sets for really cheap. I don't know where they come from, but I tried a set a while back and they are working well. I think I paid $50 a set for them. It was worth the experiment.
#24
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Don't know the specific cam specs, cam by crane..lifters also. Motor is built back to stock 420hp specs. bottow 1/3 is where lifter actually broke, sounds similar to your experience laz mesa.
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Good luck next time. Glad you have a warranty.
#27
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i would like to see a pic too, i'll see if i can't get one from the engine builder....he'll give me the old pieces if i want them.....once he finds them!
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About a year ago, one of the car mags had an article about GM's special facility where they were hand assembling the Corvette Z06 and Cadillac hi-per engines. The article stated that they coated all the critical moving parts with "GM Camshaft and Lifter Prelube" (p/n 12345501) before firing the motors. They shipped them with Mobil 1 Synthetic in the crankcase. A 4 oz. bottle of the prelube is about $8 and my local GM dealers don't always have it in stock. They tell me that they often use the old standby-EOS. About the same time, I believe it was Hot Rod Magazine had an excellent article on cam failures. As I recall,for flat tappet cams especially, they recommended EOS in the crankcase until the first oil change. After that,they recommended a bottle of the Prelube to offset the concerns about ZDDP. Anyone interestested might do a Google search as my old memory ain't too good. I've been adding two bottles of the prelube to each of my 800SC's for two seasons now. 170 hours since a Sterling rebuild and the valve covers have never been off. Just tryin' to help....