59AB flathead with 3 1/16 bore question!

[Mike B]

Very nice looking car and engine!

Again, I don't see why the new block wouldn't treat you well, unless you have to have, or want to go with, more cubes than you can get from it.

[Ed Pitts]

"is it also a 3 1/16?"
Yes, it is a 3 1/16. It was a standard block with no cracks that I bored out to 040 over. This is a post war replacement block. Ed

[53OlderThanMe]

I have one also, fighting stud removal. Mine is 221 cast with the 59 on the block just like those pictured already.

Maybe they are not so rare after all...

[dude]

I have one of the same blocks you working on. I believe these were cast after ww2 as replace blocks for 221 ci. They were machined with a 3 1/16 bore. Mine had plenty of meat for a 3 3/16 rebore. Great block for a fresh 239 ci engine. hHave your machine shop check it out for wall thickness and go for it.

[Ed Pitts]

Here is an updated version.

[scooder]

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Originally Posted by 31pickemup

Is it worth rebuilding?

Hell yea, you say it ain't cracked, then it's got to be worth rebuilding. I would definitely get the bores sonic measured, this is because as I/we have now realized these small bore 59 blocks ain't all the same castings. As I stated mine has the pencil ledge, and looks like it may go 3 3/16", but not much more, these blocks were cast to be bored for the smaller bore. I have a couple of 21 stud blocks here and they look like they have thicker cylinder walls.
But, big but, yours has no ledge, so maybe it is a normal 59 type 3 3/16" casting that was only bored to 3 1/16". If this is the case it will go 3 5/16" and bigger, just as a regular 59 block.
You may very well have just scored a peachy block.
Martin.