What kind of engine (make,model,year) were there two different length pushrods might have mixed them up
Worn out cam lobe .
Please ask once and wait.
SOURCE: 1992 chevy lumina eurosport- not the same as a
ok i understand what you are saying now.
the euro sport is the same as the lumina base just with a body kit, stiffer suspension, and dual exhaust.
but on the 3.1 engine the pushrods are all the same length, but depending on the stroke each cylinder is on the pushrod may be in a different position.
you are assuming that every pushrod should be in the rest state. that is not true. if the cylinder you are installing the pushrod for is on the intake stroke when you install the intake valve pushrod and tighten the rocker arm nut the valve will procede to open like it should be open for the intake stroke.
this is normal and its nothing wrong with it.
SOURCE: How to replace lifters on a 360 V8 engine?
I find it hard to believe that it runs fine but, to replace either, you need to remove the intake manifold. Likely you will find both items in the lifter galley. Before dropping a lifter in there, make sure the cam lobe is still good....If the old lifter is severely worn on the cam end, likely it's not. After replacing the parts, but before replacing the valve cover and manifold, turn the engine by hand and make sure that the valve opens and rocker travel is the same as all others.
The r&r is covered in haynes and chilton manuals. One tip is to always use washers on any bolt that attaches the manifold to the heads to spread the torque load and yes, always torque any aluminum manifold to prevent warpage..
If either part has fallen into the oil pan (unlikely) it actually can stay there forever without harming anything.
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SOURCE: My Navigator makes a rattling noise at startup and
if rattling sounds like you have a bad pulley bearings on pulley going out pop hood and look at belt with running see if it is moving correctly not going in a back and forth motion like warped llook at pulleys see if they are displaced
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