so should the oil got from block to cooler to filter to block OR block filter cooler block ?

1/ Some say block-filter-cooler-block.

2/ I prefer block-cooler-filter-block. This is because building a cooler involves a lot of soldering and I am always afarid there will be some solder balls that will get loose after time and get into motor.

I beleive OEM is method #1

This is how we would do it

I cant open the darn file can you explain it please

I have exactly the same philosophy as Wobble. Especially true with used/reused coolers and lines.

lets try this
out of the block
into the cooler
into the filter assy
back to the block

Hmmm, warmer oil flows easier through filters, Ill stick with the tried and true Merc method of block, filter, cooler.