I got a set of 57 Chevy 283 heads dirt cheap from a local car club guy. He had them rebuilt 20 years ago but never used them. They were still in bags with a tag on them and had new valves, springs, etc. I took them to a machine shop to get them checked out since they had been sitting so long and they said the only problem found was that the guides had been knurled which they said was a quick fix to tighten up the valves. I asked how long they thought they would last but they couldn't or wouldn't say. This 283 is going in a 32 roadster that may get driven 2500 miles a year. Could I expect to get any life out of these or am I waisting my time. I'm working on a budget and I don't plan on pushing this engine hard.