3 5/16 bore in a 59a block

3 5/16 is a safe overbore.
No overheating problems.
Be sure to have the block pickled before
doing any machine work on it.
Hot tanking alone will not get the rust out of the water jackets.
 
I’m no expert by any stretch but I have seen a bunch of em get bored at my buddy’s shop. In 10 or so years iv seen one 59 block hit water in one hole at 3 5/16”.
May have been rusty....could have been core shift. It got fixed.
That being said im not scared mine is at 3 3/8”.
 
296 V8 said:
I’m no expert by any stretch but I have seen a bunch of em get bored at my buddy’s shop. In 10 or so years iv seen one 59 block hit water in one hole at 3 5/16”.
May have been rusty....could have been core shift. It got fixed.
That being said im not scared mine is at 3 3/8”.
Click to expand...

Roger on that.
I have seen a couple of them get into porosity at .030 over in the old days.
Sonic testing sure saves wear and tear on the boring bar these days.
 
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