1958 Edsel E400 production would have most definitely had to precede Ford 332/352cid production, since job one was July 15, 1957 for the Edsel, and October 10, 1957 for the 1958 Ford. We can surmise that since pre-production junior series 1958 Edsels exist from April 1957 that E400 pre-production mi...

Thanks for the very valuable contribution. 1958 T-bird began production on December 20, 1957, so if the hydraulic tappets had any connection to the transition to as-cast combustion chambers, that will put the machined combustion chamber E400's closer to the region of 80 percent of total production, ...

The E400 could not have been derived from a detuned or derated 352cid (solid-lifters-machined combustion chambers) because it was sold nearly two months before 1958 Ford's introduction (Sep 4, 1957). If anything, it would have been the other way around. Although the E400 had hydraulic lifters, the e...