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  • #1

    collapsed lifters

    does anyone know why lifters collapse? my 95 z28 just got a big buck valve job with new valve springs. after three days,one lifter started to tick,and twenty miles later they were almost all ticking.Pulling the valve cover revealed six out of eight rockers can be pushed down to the lifter bottoms (rocker have oil).
    Can someone explain how a 93k mile engine can do this?
    Tags: None
  • #2
    sounds like the rockers were not adjusted correctly when the valve job was done.
    96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
    11.6 @ 123mph (1.6 60' - getting there )

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    • #3
      Or excessively heavy valve spring pressures.

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      • #4
        My first thought was a bad oil pump. I know my oil pressure goes pretty low at idle. From the threads I have seen, low oil pressure at idle seems to be pretty normal for LT1 motors.
        2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

        1995 Z28, many mods, SOLD

        A proud member of the "F-Body Dirty Dozen"

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        • #5
          Oil Pressure

          The lowest my oil pressure goes is 25lbs at idle. What is yours doing?


          99 Silver Z28 A4, T tops, ZR-1 wheels (SOLD)

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          • #6
            I don't have a calibrated gage but it goes below the 20 pound line on the dash. I have seen several post on here about it going down to 15. I think 25 is the highest I have seen it on the message board..
            2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning

            1995 Z28, many mods, SOLD

            A proud member of the "F-Body Dirty Dozen"

            Comment

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