I bought a 97 suburban, 454 vortec 159k miles. It had a broken valve spring. PO changed the spring but the valve had dropped enough to hit the piston and bend, so no compression on that cylinder. I bought it so I would have a spare engine for my truck, since they are hard to find even as cores.
What would cause this? The engine is real clean inside, no sludge but this is due to the factory rochester injectors leaking, like mine did. It is a low lift roller cam, not a lot of stress on anything. And the springs have rotators. It was an exhaust valve, number 6 cylinder.
I am a little worried. My truck has almost the same mileage, and if it happens on the road its a tow and a lot of labor. I just had to swap the cam out of mine due to it going flat, which was absurd.
What would cause this? The engine is real clean inside, no sludge but this is due to the factory rochester injectors leaking, like mine did. It is a low lift roller cam, not a lot of stress on anything. And the springs have rotators. It was an exhaust valve, number 6 cylinder.
I am a little worried. My truck has almost the same mileage, and if it happens on the road its a tow and a lot of labor. I just had to swap the cam out of mine due to it going flat, which was absurd.