2-speed pics
 

I was looking at 2-speeds pics in an earlier post about rear main babbit and noticed their appears to be a crack running from the bottom of the cylinder wall all of the way to the cam bearing bore. Or is it just my 80 year old eyesight.
Ed

Re: 2-speed pics
 

Id say yes!

Re: 2-speed pics
 

I would say no unless it was a crack that has been welded?

Re: 2-speed pics
 

If I see stuff like that, I would check it with a magnet and powder or a die penetrant to make sure it's not. The line on the cylinder looks too straight to be a crack but it's worth the trouble to confirm that. From my own experience, cracks are generally visible with the naked eye but not always. Castings tend to have all sorts or trace lines and other questionable possibilities of cracks. Many are not cracks but are worth a check anyway.

Re: 2-speed pics
 

I will go with Rotorwrench on this one. Check it.

Re: 2-speed pics
 

Looking back at the pix above, I see MANY cracks between and across the rear main flange, extending into the cam shaft bore, and extending from the cylinder bore up into some parts of the block.

The cylinder wall one may not be a killer - think low compression (end of stroke) and primarily low mechanical forces there. Unless the crack goes through the side of the block with an oil leak there (seems like it should be the oil fill side.)

The crack across the rear main flange would be a reason to condemn the block.

2speed's thread is at https://www.fordbarn.com/forum/showthread.php?t=338702

Marshall seems to have been the contributor of the pix above?

Joe K