I am sure there are lots of experienced hands here that can tell me what a good performance cam with decent fuel mileage I could put in my '95 fathers C1500 silverado//5.7L. engine is stock with an auto tranny......13 mpg is about all I can squeeze out of it and it doesnt have many miles on it. Use it for general use but sure could use a little more power. Looking for a cam that doesnt require changes to the rest of the valve train. Thanks!!!!