Lifter wear.
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Lifter wear.

  1. #1
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    Default Lifter wear.

    The original cam that came out of the 83 indmar 454 in my 83 sleekcraft went flat on the exhaust lobe on #8. After a complete rebuild and one short season I tore down my 454 and found the same lifter worn on the same #8 exhaust. The lobe looks good. The lifter bore feels good with no burrs and the lifter slides and turns just like the rest. The cam is a comp Hyd [email protected] in a 10.8 454. Any Ideas other than the lifter isn't spinning enough. Can I get away with replacing the lifter for one more season or shold I replace the cam?

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    i'd be lookin for oiling issues and spring pressures to start, something like that. if the pressure is too tight on that valve, it'd wear quik, or if its coil binding.too much preload will eat em up too.

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    Quote Originally Posted by IMPATIENT 1 View Post
    i'd be lookin for oiling issues and spring pressures to start, something like that. if the pressure is too tight on that valve, it'd wear quik, or if its coil binding.too much preload will eat em up too.
    Everything was new including valves springs guides ect ect comp roller rockers. I am running a melling blue printed pump and always ran good oil with an additive. The springs,pusrods retainers and locks were bought with the cam and there is no bind issue. I am wondering if the lifter bore may be machined a little off or something I do remember that I had quite a bit of trouble with that valve rocker alignment before I went with the Dart guide plates. It is kinda of odd that the original cam went flat on the same lobe. i guess I replace that one lifter and run the crap out of it for another season. Thanks again

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    Senior Member H20MOFO's Avatar
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    I'm no expert, but I don't think you can "feel" if the lifter bore is toast(out of alignment, ect.
    Another Hot Boat refugee

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by H20MOFO View Post
    I'm no expert, but I don't think you can "feel" if the lifter bore is toast(out of alignment, ect.
    True, the bore may be glass smooth but a touch out of alignment, get it checked.

    Also, try to make sure there is nothign clogging oil suply to THAT lifter bore.

    Doesn't matter how good the oil pump is, a slight blockage will reduce oil flow, but I'd bet on alignment first.

    Also spring pressures. What's the seat and spring rate?
    If they're pretty stiff (like I consider mine, pretty stiff for flat hydraulics, 135# closed and 400 #/inch) did you break the cam in WITHOUT the inner springs if you run a 3-part set? Much better than trying it all at once.

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    Quote Originally Posted by SmokinLowriderSS View Post
    True, the bore may be glass smooth but a touch out of alignment, get it checked.

    Also, try to make sure there is nothign clogging oil suply to THAT lifter bore.

    Doesn't matter how good the oil pump is, a slight blockage will reduce oil flow, but I'd bet on alignment first.

    Also spring pressures. What's the seat and spring rate?
    If they're pretty stiff (like I consider mine, pretty stiff for flat hydraulics, 135# closed and 400 #/inch) did you break the cam in WITHOUT the inner springs if you run a 3-part set? Much better than trying it all at once.
    Boy I don't know out of pure ignorance. We ordered the premium springs from comp to match the cam. Rods machine shop here in Colorado springs cut the 049s for 2.19s and set all the spring heights ect. I doubt he missed anything. I am not making enough HP to trun it over 5100 but I have run it at 4900 for twenty minutes a few times. I'll take a long close look at the bore indexing when I get the block back. I wish I would have went with a solid to begin with since they have the weep hole lifters now. This engine only has to make through next season before I go bigger.

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    Senior Member Brendellajet's Avatar
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    something aint right. For it to run for as long as it did & then go flat, and is now going flat again, Id bet something is clogging the oil delivery to that lifter.

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    LP-25.com Infomaniac's Avatar
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    Lifter bore alignment

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    TEN THIRTY ONE RCB19's Avatar
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    Quote Originally Posted by Infomaniac View Post
    Lifter bore alignment
    What he said. GM has been known to turn out a few bad batches of blocks with some core shift. Get a different block or have a competent machine shop re-index the lifter bores in your block.
    RCB

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    Senior Member Morg's Avatar
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    What kind of rockers are you using?

    And has #8 rocker moved between rebuilds??

    BTW-Which way does the oil flow on the BBC in regards to the lifters?
    Last edited by Morg; 02-10-2008 at 09:46 PM.

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    steelcomp was here
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    Quote Originally Posted by RCB19 View Post
    What he said. GM has been known to turn out a few bad batches of blocks with some core shift. Get a different block or have a competent machine shop re-index the lifter bores in your block.
    Ditto
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Quote Originally Posted by steelcomp View Post
    Ditto
    Ditto, No.8 on GM blocks over the years have been a culprit when it comes to correct angle. YOur either going to have to get the lifter bores blue printed to fix the problem or go to hyd roller set up.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by Morg View Post
    BTW-Which way does the oil flow on the BBC in regards to the lifters?
    On a Mk-IV's Priority Mains system, the oil pump feeds the filter, filter output feeds the L/H gallery just above the pan rail, the gallery feeds a vertical passage that feeds the crank mains down and the cam bearings up.
    Oil to the lifter galleries flows around the rear cam bearing, to the 2 lifter galleries. The lifters are set IN the galleries. Now that I look at it, there should be far worse problems going fwd, if the oil to the #8 lifter was blocked at all.

    I'm still looking hardest at alignment, especially since it ran a while, quite a while, before flattening. I'll bet the lifter is not turning much, if at all. A cvery small ammount off would jack up the inteface to a flat tappet lifter, hyd, OR solid.

  16. #14
    steelcomp was here
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    The only other thing you might check is valve guide clearance on that valve.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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