Question about 1983 Chevrolet Silverado

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Its a 1985 chev 350, approx 160 hp.

I had a bent push rod on intake valve (#7)and dropped the rod. took off the oil pan, but cant see the rod. Any idea what I can do? will it have dropped far, or can I use a magnet to retrieve through the head? Or can I take off the intake, and leave the head on. Feeling stupid over here.

ty DC.

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Remove the intake most of the time it wont go past the galley but you cant ussally get it out through the small holes they come through

Posted on Jun 08, 2008

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I own a 1968 Imperial 440 V8. The intake valve push rod of the #1 cylinder bent and was causing knocking noise. I replaced it and the motor ran fine. The #1 cylinder started missing. Again it was a bent...


bent push rods come from improper movement of the rocker and valve
This can be from an incorrect length push rod-- some v8 engines run different lengths for inlet and exhaust
from rocker arm jamming on the shaft or rocker ball
hydraulic cam follower pumping up and jamming the valve spring to a solid block
bent valve stem above the valve guide
valve spring Colette moved or misplaced incorrect rocker for that valve-- some engines run different length rockers for inlet and exhaust
what to do-- if this engine was running all right for some time then the rocker can be omitted. if the problem has been occurring since the cold weather the the oil may be too thick and not allowing the follower to leak down properly
check the follower or replace it , change to a lighter viscosity oil for the duration of the cold weather
unless you have had a recent head change or other mechanical work done the problem will be in those areas.

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Something like that is sure wrong in #7. If you do a leak-down test, it should tell you if it is an intake or exhaust valve losing compression, or exactly what it is. A bent push rod would be a blessing. Then maybe you wouldn't have to take the head off for repairs. Roll a push rod over a glass surface to check for straightness.

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You are thinking too hard.

It is VERY simple. The Intake valve push rods (marked with ORANGE paint) are shorter than the exhaust valve push rods (marked with BLUE paint) If you cannot see the paint, you can always stand them up next to each other...it is pretty obvious which ones are which.

BOTH heads are EXACTLY the same - they are interchangeable. It is just that one is turned one way and the other is turned the other way so the exhaust and intake ports will be on the correct sides. (intake port towards the center of engine, exhaust port to the outboard sides of the engine.) You do not need to go searching the internet for some "order". All you have to do is LOOK AT THE HEAD to tell which valve is intake and which valve is exhaust.

So then it is as simple as: Put the short push rods on the intake and the long push rods on the exhaust....

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