They made a large heavy OHV casting and then only gave it the same basic CID as the flathead it replaced. What were those whiz kids thinking? Even Olds started with a 303 and it was noticeably more powerful back in 1949. Overconfidence can be a killer! It certainly didn't help ford sell those cars.
[FONT="]Ford actually outsold Chevy in '54 for the first time in many years. Number one in sales for 1954, in fact. Another commenter called the '54 Y Block gutless, but compared to what? The Olds engine of '49 was impressive, but Olds was two sales market notches up from Chevy, Plymouth and Ford. Compared to those other two of the same year, the '54 Ford stacked up pretty good. [/FONT]
[FONT="]The 1960's are thought of as the horsepower wars, but the real horsepower
explosion came in the 1950's...e.g., Ford produced v-8 engines that made barely over 100hp in the beginning of the decade, but
offered cars with engines that were pushing 350 by the end of the decade. That's a 300% increase...and with that in mind, comparing a Y block from '54 to Y blocks just a couple of years later in terms of power isn't using the correct context. [/FONT]
[FONT="]My '54 RW has it's original engine and has never been rebuilt, but it runs smooth and quiet, and in (od) it'll cruise on the highway at 65 mph all day long. I've even had my non-rebuilt original engine car up to 80+, but only once or twice. Having said that, I've heard that rebuilding the 239 Y block isn't an easy endeavor, as apparently changes were made throughout the year, and (as the OP said) there's apparently some non-interchangeability with the later years. If it ever comes to that, I'll probably go with a 292 or 272...and when I do, I will, as always, rely on your generous sharing of experience and knowledge here at the Ford Barn. [/FONT]