#3 sounds familiar, but that was a lifetime ago, when I was in high school. The rebuilt engine was very peppy and responsive, but didn't stay that way. Pretty quickly it went fairly sluggish again, and I wonder if that valve just burned up again? Flat out on the freeway it would only do something like 65 MPH. I didn't do any of the work, so I can only assume nothing was done about the timing on the #3, assuming that was the reason it burned up in the first place.
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