I'm baaaack with another escapade that leads to more questions.
My situation: Truck is a 1953 3100, with an engine that does not run and needs replacing. The replacement engine is from a 1961 Impala and is a 235 with hydraulic lifters. I've posted several questions and issues that needed resolving, so there is lots of history here. Long story short, I got the engine running last summer and was hoping to get it into the truck this summer.
Today, I was out in the garage running the engine and I came across an issue that I had not seen before with the engine. I was revving the engine, trying to simulate running through the gears. On my modern cars/trucks, I usually shift gears when the rpm's hit around 3,000 give or take. When I got the 235 on my test stand up to about 2,800, I heard a "tinny sounding" metal on metal sound. I backed off the throttle immediately and it went away. Revved it back up and the metal on metal came right back. Backed off and it went away. I continued to let the engine idle until I drained the small fuel tank and it ran as it has always run. In fact, as the fuel was running out (and presumably the mixture leaned out alot) the engine was running great. After I shut down the engine, I removed the valve cover and found nothing out of the ordinary. I checked the side engine cover and found nothing that jumped out at me (like a bulge in the metal plate), but I did not remove the plate.
My questions: Did I over rev the engine? Any ideas what the metal on metal could have been? If I did over rev the engine what could I have damaged and is there anything specific that I should look for?
I'm really hoping that I didn't bollix up the engine and ruin my plans for getting it into the truck this summer!
As always, any thoughts or suggestions are welcomed.
Thanks!
