Man it's been a lot of years since I've worked on an FE. I have a 57 F-100 that I am tossing around the idea of a mean FE engine in. I found a truck for sale local (1965 F-350) that the seller claims had a 428 upgrade in the 70's. The original engine was a 352. Everything under the hood looks correct for a stock 352. I thought the harmonic balancer had an extra little counterweight on a 428, as they are externally balanced, but some reading I did said only the CJ engines had that. To all of you FE experts: short of measuring stroke or tearing the engine apart: is there a way to ID a 428 (or maybe just a 428 crank) visually? I thought I could by the damper, but I am not too sure now.