Finally got to do the cam and lifters in my '77 C20 this weekend, It has 125,000 miles on it and found the badly stretched original timing chain still there but it was the cleanest mid 70's engine I've taken apart. I was told the former owner religiously changed the oil at 3,000 miles and it showed, valve covers were dirty but no sludge anywhere. I didn't realize how little power the truck had, It wasn't as slow as my Volvo 245 but not by much. Now it's surprisingly quick, has no more oil leaks, and sounds 100% better.
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