[ERA427]

I didn't specifically notice it when it happened. I was driving around town. I don't think I over-revved it, but that's the only idea I can come up with. I've heard others online say that the stock 428 springs were junk, but I don't know.

The engine still runs, abeit rougher. I believe the lifters and cam to be original to the engine.

I have a bent pusrod and broken spring on the the intake valve. I haven't pulled the heads but have done everything else I could to try to deduce that nothing else is damaged.

So... what could have broken the spring? I'm pretty stumped on this. I never heard a big clink or bang when driving. It was more as I pulled into my garage it occured to me that it didn't sound as smooth as when I left.

If you have any suggestions of what else to look for, please help. The valve itself seems to be okay. I pressurized the cylinder with an air compressor, and it seemed to seat properly and seal.

The engine has been rock solid for the 4 years I've had it.