engine diagnosis

Q: I have a 1973 Ford Ranchero. It has a stock 302 engine with a two-barrel carburetor, a C-4 transmission, and an open-type rear axle with 3.08 gears (I think). The only modifications are headers and a dual exhaust. At about 50 miles-per-hour and above, the engine starts to break up. Acceleration up to 50 is

What do you hear when you listen to your engine? The primal roar of high performance? Or is it more like a cry for help? OK, we never want to think of our engines doing anything but chewing up asphalt and waking up the neighbors—let alone crying! But even the manliest of mills can have problems, and the sounds