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Eric, it's quite likely his '74 140 didn't get or need a new cam. I don't think many, if any, of the '74s such as mine, had the problem cam even though they were listed as a possibly affected year. It was likely listed as all B20F production years not knowing exactly when the the last of the bad cams had been used in production at the various plants, even the parts chain. There may have been no identification to distinguish them, just the ship date and last VIN before the problem was identified. Even if his did have one, they started to show wear quite quickly and I'd expect it would have needed replacement long before now.
I bought my '74 new and I remember the cam issue not being an actual recall, rather a TSB to dealer service. It would have been to inspect the cam lobes for signs of premature wear whenever checking/adjusting valves such as at the major service intervals. The cams would of course been covered under the normal warranty, but these were fairly short then, like a 24 months powertrain warranty?
I was aware of the problem and used to check/adjust my valves at every oil change, so inspected for cam lobe wear for a few years until I finally felt comfortable I didn't have the bad cam. Something in the back of my mind at the moment recalls the warranty may have been extended for the cams, like an extra 2-3 years, which is about how long I kept checking. My indie had shown me a bad one he had and what to look for. I do recall it soon became fairly well known the problem mostly only affected up until mid/late '73 model year production, leastwise here in Canada with ours from the Halifax NS assembly plant. As I recall, US 140s were mostly Sweden back then, so your experience may be different. I sold my '74 144GL in 1989 at 175K mi, still happily with the original cam.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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