Check your coolant level. If it's down, then check very carefully for
coolant on top of engine (Q-tip on a stick). Look at the cross-over exhaust
underneath while the motor's running. Is there coolant dripping down the
back side? If any of these are true, then your intake manifold is leaking
and you might be getting coolant into the oil and/or leaking into the lifter
valley from above. Don't ask me how I know ...I'm 19k into a second intake
gasket and it's leaking again, and the lifters are making noise again.
that is a hydraulic roller cam in that block,
and yes you can replace a individual lifter but i would replace the entire
you can try adjusting the lifters but chances are the lifters
are collapsing from age.
Roller lifters are heavier than a flat tappet lifter and require more
spring pressure in order to keep the lifters in contact with the cam lobes
at high rpm's,
the increased spring pressure is hard on the lifters and causes them to
collapse over time.
You don't have to change the cam with the lifters
(unless you want to).
vortec heads wont support more than .460" lift w/o
cutting the seats and changing the springs as well as elongating the
push-rod guide holes.
Vortec heads also require self aligning rockers or guide plates (your
"Frank Ross" < firstname.lastname@example.org> wrote in message
You know I'm not a big fan of magic additives to put in engines. But a lot
of people have sworn that Rislone can help clean varnish from engine parts
such as lifters. I'm not saying that's why it's noisy, but I don't think
that you've stated the mileage on the motor. So it's possible that the
lifters are dirty and not worn out. Do you change the oil frequently?
A friend just had this problem and had the engine (Vortex in a Taho)
compleatly rebuilt block boiled out The rebuilder has been at it since the
sixtys After rebuild 300 miles it started banging again. It seems the
lifters failed. The lifters were Federal Mogol. In talking to others it
seems that is a problem. The rep said no way.
But have you ever seen any one take responsibility for a bad product?
They are now installing perfect circle lifters I will do a followup in a
couple of weeks entitled "lifter update"
to let you know haw it plays out
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