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Old 08-26-2006, 11:05 AM
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Stuck intake valve

I have a brand new 350 crate motor that has approx 1 hr run time on it...first 30 minutes it ran great then it developed a terrible idle and I noticed a clacking sound on the left side, so I pulled the valve cover to find the #8 intake valve stuck open and the push rod bent with the end toward the lifter broken off...any ideas on what caused it, do you think with the valve stuck open that the piston could hit the valve? I have vortec heads, hyd lifters with 202 intake valves. What is involved in fixing it? Thx...Joe

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Old 08-26-2006, 01:08 PM
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The valve guide could have seized the valve. It's apparently only partly open because it snapped the pushrod.

It will require pulling the intake and that head. You can check the cam lobe for damage with a dial indicator. I would replace the lifter, pushrod and check the rocker. You'll be able to inspect the piston with the head off.

I wouldn't mess with the head. Take it to a machine shop and have them check it and hopefully fix it.
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Old 08-26-2006, 04:11 PM
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make sure you set your timing right away when you start the engine,then get it to temp. and check it again.timing can cause cylinders to run hot and cause the valves to hang up.thats why when i build an engine i'm there when it is started for the first time in the car,you can't trust that a customer will do this and come back saying i did something wrong.
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