I know this has been touched on in a couple forums, but giving it another shot. Anyone have insight into the inverted or upside down “Y” 59 series blocks? Getting ready to dig into this one, would love to gain a little insight in regard to origins.
Lots of theory's on those markings, but I dont think any actual Ford factory information has ever been found
I have a few of the weird letter blocks, but none of them have the letter upside down. Well, maybe the Z block is. Course the X block could be too….
Yeah, first hand knowledge to me, I know as most we're lead to believe those odd letters L, X, Y, Z etc, were said to be higher nickel castings & as has also been said & in print better for bigger bores, if that is true not sure how the possibility of core shift was dealt with ( vibration during casting perhaps) ???? I do know the long time owner who originally dirt track raced my 32 was always on the hunt for x & z codes & as he claimed they were used in military applications specifically tanks, I would assume the smaller armored personnel units... as it would seem the bigger stuff was diesel powered or used the big block flathead. I Currently have a 59 block with an L code raised casting turned sideways & slightly down on the left side of the bell housing area a true L code ??
I was under the same assumption in regard to military applications. The oil pan suggests large truck on mine as well, so most likely industrial …?
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