Cylinder wall thickness

Now the one at the shop is a 75 block with really nice looking cylinder walls. Stock bore also.

Do You (or Your machinist) have access to a borescope?... besides sonic tests a borescope
inserted into the 'freeze plug' openings can reveal a ton of info on INTERNAL casting integrity, Read ability to flow coolant :D

I am considering having the metal hardness checked as well.

By all means do so, 'nip' a piece off the block and have the Nickel content checked...
A bit more $, But, 'rule of thumb', 1/2-3/4 % nickel content = no 'flexy flyer' Main saddle
alignment or 'bore wiggle' when pounded on :D

younggun2.0 said
I plan to bore it .033 I am just wondering what good wall thickness numbers looked like. If I find out it has bad core shift or marginal wall thickness on the thrust sides then I will get another block. Trying to start with a good foundation

wsuwrhr said
.18 is the min you would really want in a cast iron block. But the thicker it is, the better. The "thrust" side is the thickness you should be concerned with. It can be thinner on the non-thrust side, but I would never go below .15 on the non thrust side.

With respects I humbly disagree Sir, I would not go below .18

Notes on 'thrust sides',
Most all I.C.E's on the planet have a clockwise rotation, (with the exception of some Hondas, and Cummins)...
So...
The Major Thrust Side on the right bank is nearer the exhaust ports, While the Major
Thrust Side on the left bank is nearer the intake ports, regardless I would not go below
.18, EDIT, ON ANY SIDE, apologies .

P.s, subscribed.