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1. MHHAUTO FORD IDS 59 ARCHIVE
2. MHHAUTO FORD IDS 59 FULL
3. MHHAUTO FORD IDS 59 CODE
4. MHHAUTO FORD IDS 59 SERIES

These 59X and 59Z blocks usually bore to 3-7/16″ with no problems.

MHHAUTO FORD IDS 59 SERIES

The 59X and 59Z have their raised 59 identification number located on top of the bell housing like most 59 series blocks.Īll blocks I’ve seen had both the X and Z lettering stamped in the bell housing on the right side near the hole for the stay rod. The few I’ve seen did not have factory reliefs. They are the longest wearing 59 series block and are the blocks of choice. The machinist who bored it to 3-7/16″ said he would NEVER bore another one because it ate cutters like they were Snicker candy bars. I stumbled across my first one in Texas in the early fifties at a wrecking yard. I don’t know if that’s true, but I do know the ones I’ve seen were VERY hard. Rumor has always held these were cast with more carbon, vanadium, and other hardening elements to meet the more stringent military specifications. These 59Y blocks are quite scarce.The 59X and 59Z blocks were made for military use and came exclusively in military vehicles. Some of them have the raised, or stamped, Y located on the right side near the stay rod boss.

MHHAUTO FORD IDS 59 CODE

The raised 59Y code is located on the top of the bell housing. These exhibit a greater resistance to cracking and wear than the 59L block.

MHHAUTO FORD IDS 59 FULL

They are slightly harder than the 59L blocks and, hence, more desirable when building a full house engine or one that will be raced. Like the 59L blocks, a 3-7/16″ bore is possible. These usually came without a factory relief. But, like the 59L blocks, many are found in cars from both sides of the Canadian border. The 59Y block was thought to be for industrial applications only. These 59L blocks are now scarce, but can still be found if one is diligent and lucky. Some of them have only a raised 59 number on top of the bell housing with either a raised, or stamped, L on the right side down near the right stay rod boss. The 59L is located on the top of the bell housing and is raised. Due to their increased hardness, they will tolerate a bigger bore without cylinder wall flexing than the softer blocks.During the mid-fifties, I bored about a dozen of these to 3-7/16″ without any problem…. The 59L blocks are harder than the 59, 59A, 59AB blocks with an accompanying increased resistance to cracking and wear. But, after having seen several 59AB and a 59L blocks cut into sections, and after extensive measuring, I’m convinced all of the 59 series blocks with a 3-3/16″ bore were cast with the same cylinder wall thickness. There is a general belief 59L blocks have thicker walls than other blocks. I seriously doubt they can be bored this big since the walls would have to be SUPER thick to tolerate boring an additional 5/16″! (From rod nut 1/30/03: These 59L blocks with a 3-1/16″ bore can only be bore safely to 3-3/16″ +0.60″.) I’ve never tried boring one of these as a 3-3/16″ block (to 3-3/8″). However, there are many around with the smaller 3-1/16″ bore.

Many came with a factory relief and a 3-3/16″ bore. The raised 59 number and letter (if used) are located on the top of the bell housing.The 59L was thought to be a Canadian truck/bus block, but many were delivered in US cars that came directly from USA factories. which is why they’re also the most common blocks still around today. These were the most common blocks produced…. These will almost always bore to 3-3/8″ and still have adequate wall thickness left for street use. These are the softest castings of the 59 series blocks. The 59, 59A, and 59AB usually had no factory relief. There were eight different engine designations to my limited knowledge: 59, 59A, 59AB, 59L, 59X, 59Y, 59Z, and 59ERP. All came with replaceable hard valve seats. There aren’t any differences between Ford and Merc blocks during these years. The 59 series blocks came in ‘46-’48 Ford and Merc’s. The following boring limitations are what I use for engines intended for the street. This decreased the number of blocks with excessive core shifts. The 59 series blocks had better quality casting control than earlier blocks. Let me begin this by stating the following is what I’ve learned and believe from my association with flatheads. MY BELIEFS REGARDING DIFFERENCES IN 59 SERIES BLOCKS. We’re archiving some of the threads, so that his work is not lost or forgotten and so they will continue to educate flathead enthusiasts for years to come. All threads from this source will be titled using the B.B.

MHHAUTO FORD IDS 59 ARCHIVE

in the title represents that this is from the archive of the late Bill Bently, who ran a flathead Q&A informational site before he passed away.