How did OEM's break in flat tappet cams??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-19-2010, 06:49 AM
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How did OEM's break in flat tappet cams???

I'm about to put my first SBC together, and I've read many posts and articles about breaking in a new flat tappet cam, but my question is: How did GM do it when these engines were new? I can't believe they ran every engine for 20 minutes or more to break in the cam. Or did they?????

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Old 11-19-2010, 06:56 AM
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They used oils with lubricity/wear additives like ZDDP plus didn't have excessive spring pressures like many of us use when we build a modified engine.
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Old 11-19-2010, 07:41 AM
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I don't know for sure but I don't think the broke them in at all, the oem camshaft was much milder than a performance cam. Even the book 'how to rebuild a small block chevy' by D. Vizard, which is an older book geared towards a stock type rebuild, makes no mention of breaking in the cam.
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Old 11-19-2010, 07:52 AM
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That's interesting. I wonder if that's why older cars had engine break in guidelines for the first 500 miles or so. I wonder if this accomplished the same thing.
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Old 11-19-2010, 08:02 AM
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At one time, at least some Chevy engines were run in for a brief time using propane or some such gas. I heard that this was no longer done, at least to the crate engines- but I have no confirmation of this, all hearsay.
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Old 11-19-2010, 10:10 AM
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here is a useful document on break-in : how and what

http://www.zddplus.com/TechBrief12%2...20Break-in.pdf

- Stephen
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Old 11-19-2010, 10:28 AM
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cam break in

First the oems used quality cam-blanks,I know several cam grinders(small operations) they tell me most mass cam suppliers buy cam blanks from china at 10 to 12 dollars@.they tell me a older core reground from oem stock is far better. I use a molly past on lobes and lifters always new,sensible spring pressure,they ar broken in with in 50 miles or less. or purchase a known cam with decent iron quality. cliff
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Old 11-19-2010, 12:13 PM
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Cams for as low as $14.00.
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Old 11-19-2010, 10:13 PM
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Quote:
Originally Posted by cobalt327
Cams for as low as $14.00.
cam blank,is un ground cast cam.
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Old 11-20-2010, 07:51 AM
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Back in the early seventies. I used to buy General Kinetics cams for $14.00 each ( orders of 10 min).
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