Flat tappet cam.....
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Flat tappet cam.....

  1. #1
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    Default Flat tappet cam.....

    I putting together an engine, for a P.O.S. cruiser I picked up cheap, out of some left over 454 Mag parts....

    .....I was hoping to use the old cam as this is a "budget' deal but am worried after reading all the flat tappet horror stories....

    The cam came out of this engine and looks to be in good condition but I failed to mark the lifters when I pulled it apart... Can I just use new lifters and break everything in again ?

    Are there any lifters on the market that are worth a sh!t ?

    Is there anything else (besides going to roller) I can do to prevent it from failing?


    Thanks,

    Doug

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    Senior Member EVILFORCE's Avatar
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    Yep. Just put new lifters in. The last few motors I have built I used Crower and you can buy sets of Crane for $40. Lots of oil stories here. I use Amsoil with Hi Zinc. Several other oils work as well.
    No Fool Like A Old Fool is there?

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    gn7
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    The idea of using new lifters on an old cam is always an iffy proposition. It has been done, and it has failed. One thing that really counts in this deal is the time is on the cam, and how much taper is left in the lope. I can only tell one thing for sure. You have to treat it as though it is a new cam install. Single springs, moly on the cam and lifters, breaking oil or additive, 2000-2500 Rs, over filled pan, etc etc.

    But ultimately, it's going to depend on the condition of the cam the start. The closer it is to new, the better off you will be. The more worn, the worse.

    Good Luck



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    It REALLY sucks having to go backwards in technology...

    My last two builds had Morel lifters and custom ground Cammotion cams in them... Hell, that alone would cost more than I'm spending on the whole build.


    I talked with my machinest this morning and he suggested I use Crower "cam saver" lifters... At least then I'd have a chance of success.....

    Doug

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    Senior Member CK7684's Avatar
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    Even on a tight budget, wouldn't it be worth throwing in a new bumpstick?

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    Quote Originally Posted by CK7684 View Post
    Even on a tight budget, wouldn't it be worth throwing in a new bumpstick?
    I DO feel a bit better using what I've got.... At least I know it's not a "soft" core like the Competition Cam my buddy just had fail on him....


    Doug

  9. #7
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    Thumbs up clay smith cams

    ive been using clay smith cams a while now and their a nice piece . their flat tappet cams are priced unbelievably low , custom ground solid lifter was something like 175.00 lifters included . first one i ever bought had every lobes edges radius and debured looked totally different from all the cams i ever purchased , looked like care and a lot of time went into it . and after talking with them their big into boat racing . im sold on their products .
    "Ill be your huckleberry"

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    Senior Member norcal73's Avatar
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    I just got my break-in period done on a compcam xtreme. Everything went great. Oil, zinc additive 2000-2500 30 min.

    norcal73

    Quote Originally Posted by Boatally Insane View Post
    I DO feel a bit better using what I've got.... At least I know it's not a "soft" core like the Competition Cam my buddy just had fail on him....


    Doug

  11. #9
    gn7
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    I laugh my ass off every time I read about how this company or that company's cam suck and go flat, or are soft, or bent, or ground off centerline, etc etc. Its never, not one time, have I ever read where it was the builder. Not once. Those of us that don't have these issues are just very blessed people who live and eat right.



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    Distinguished Member David 519's Avatar
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    Saw the thread on another forum where a guy was doing a big inch pump gas deal. He tried a few flat tappet cams and made decent power. I haven't messed with flat tappets since Duntov 30/30 cams were popular (I never ran one, only 3/4 race cams since I didn't have pop up pistons ) Talked to the shop that does my machine work/dyno stuff. He puts a lot of them in and he's had good results as long as you do the break in right.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    Purple headed member Quickjet's Avatar
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    Quote Originally Posted by David 519 View Post
    Saw the thread on another forum where a guy was doing a big inch pump gas deal. He tried a few flat tappet cams and made decent power. I haven't messed with flat tappets since Duntov 30/30 cams were popular (I never ran one, only 3/4 race cams since I didn't have pop up pistons ) Talked to the shop that does my machine work/dyno stuff. He puts a lot of them in and he's had good results as long as you do the break in right.
    I'm gonna tell Angie that you called her a dude...............
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    Distinguished Member David 519's Avatar
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    Quote Originally Posted by Quickjet View Post
    I'm gonna tell Angie that you called her a dude...............
    Oh don't even start....
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

  15. #13
    gn7
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    Quote Originally Posted by David 519 View Post
    Saw the thread on another forum where a guy was doing a big inch pump gas deal. He tried a few flat tappet cams and made decent power. I haven't messed with flat tappets since Duntov 30/30 cams were popular (I never ran one, only 3/4 race cams since I didn't have pop up pistons ) Talked to the shop that does my machine work/dyno stuff. He puts a lot of them in and he's had good results as long as you do the break in right.
    My point exactly. But rest assured, when a cam goes flat on somebody on these boards. Its was a chitty cam. Not saying it hasn't happened. But ususally on a crazy quick pattern that probably shouldn't have been ground to start with, and installed by somebody that truely knows his stuff. But when the average flat tappet goes south, somebody just doesnt get it. there are proper procedures or loose the cam.



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    Last edited by gn7; 08-30-2010 at 07:32 PM.

  16. #14
    Senior Member Itsahobby's Avatar
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    ha ha ha, You must be talking about Dave Engine and Machine. Dave built my motor 15 years ago. I freshened it once and I am still running the same Isky Flat tappet cam.
    I did replace the rockers with Crane's.

    Quote Originally Posted by David 519 View Post
    Oh don't even start....

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