Some of the Key ingredients in cast iron to make it strong are Nickel,Molybdenum, Copper

The Little-M nickel content is 0.149, Molybdenum 0.211, Copper 0.404

Dart SHP Nickel content is 0.071, Molybdenum .016, copper 0.283

Chinese block Nickel content is 0.005, Molybdenum 0.005, Copper 0.020

Leo did the Brinell test by using the Rockwell B Scale and converting it to Brinell scale and he will back this test.

Little-M tested 200

SHP 190

Chinese block 107

I am sure the chinese blocks will vary from block to block and now I see why when I had to line hone the chinese block it kept loading the stones up as it was extremely soft.

We have one in shop right now and have looked it over and checked it for brinnel test and it seems to be a very soft block as it tested in the low 140's

To give you an idea a 010 block is around 180ish and SHP block tested mid 190's and the Little-M and Big-M are mid 230's because of the nickel content.

It lools like the block is finished honed and I have not probed it out for locations for deck heights, cylinder bore loctaions, lifter bore locations ETC.

Looks like once the cylinders were honed they decked the blocka nd left a burr at the top of the cylinder as there is a zero chamfer on the tops of the cylinders.

The lifter bores have a huge ridge at the top and on the bottom of the bores I would assume from machining the soft cast iron.

With that soft of bore it would wear the cylinders out in a short time as well as the lifter bores.

The rear main cap is not even flat where the pump sets on and they have welded what it looks like a insert where the threads are.

I will post pics later on and what we find for demensions in another thead.

For right now it does not look like a very high end peice and is surely a copy cat of the Dart Little-M block

I beleive PBM is selling them with their name on them!!