Aftermarket flat-tappet cams and no-zinc option?

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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by pila on Tue Nov 03, 2015 8:49 pm

That's a great read for anyone installing a flat tappet set.
The one part I always stress for break-in, is ::DON'T LET IT IDLE !! Very Happy Idling, for even a short term, beats the hell out of the lobes & lifters...

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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by Joe73 on Tue Nov 03, 2015 8:52 pm

I found it interesting the recommendation to fill the oil pan to within an inch of the engine block to aid in more splashing and oil vapors getting to the cam.
Never heard of that before. Interesting.
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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by BBMALIBU on Wed Nov 04, 2015 5:17 pm

ant7377 wrote:Its not the added expense of the roller cam but the damage when one of the rollers lets go that scares me but maybe im being over cautious.

I believe the GM LS motors are equipped with roller lifters.  Durability shouldn't be a problem.
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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by pila on Wed Nov 04, 2015 9:08 pm

Since about '87 or '88, GM engines have had rollers. Must have been something about gas mileage (?) And of course the changes in oil, to satisfy emissions concerns about anti-wear additives like ZDDP etc..

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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by brownbomber77 on Thu Nov 05, 2015 7:47 am

My brother has an aftermarket cam in his 350 Olds and I noticed it getting wiped out a couple years ago. The lobes were starting to show signs of scuffing to the point I suggested changing the cam. We dumped a bunch of gray stuff from NAPA and are pending results. New oil is junk for flat tappet.

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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by 1cheapshot on Sat Oct 22, 2016 1:43 am

Joe73 wrote:I found it interesting the recommendation to fill the oil pan to within an inch of the engine block to aid in more splashing and oil vapors getting to the cam.
Never heard of that before.  Interesting.

I wouldn't recommend this. To much oil causes aeration of the oil. Air isn't a good lubricant.
Joe Gibbs makes oil for the older flat tappet engines. Google it.
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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by pila on Sun Oct 23, 2016 6:38 pm

One flat tappet cam wipeout I had was from letting a fresh engine sit for a few months, before running it, even after pre-oiling it before running it....

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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by Joe73 on Sun Oct 23, 2016 6:45 pm

pila wrote:One flat tappet cam wipeout I had was from letting a fresh engine sit for a few months, before running it, even after pre-oiling it before running it....

I agree. I've read that several times. Thats why I didnt assemble my engine before doing my body work. When I do assemble it I will break it in within a week or two.
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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by pila on Mon Oct 24, 2016 5:44 pm

Every thing I've built over the years had flat tappets, and in these later years I just make sure the cam break-in is done right. That seems to be the way to assure that it lives...

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Re: Aftermarket flat-tappet cams and no-zinc option?

Post by bracketchev1221 on Mon Oct 24, 2016 6:24 pm

The more mild the cam is with low spring pressures helps too.
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