Or this .
Inspection of Parts:
First thing I do if it's a new or used block is debur and clean it. I use a bearing scraper and run around all the sharp edges of the side cover, head, and top of block area. The edges Briggs leaves on these blocks will cut you like a razor.
If the block is a Gen 1, 2, or 3 I inspect the bearing pocket area for cracks. Look closely in the bottom groove in the corners of the groove is typically where I have seen the cracks start. You will have to look close and make sure you have good lighting. I have even gone as far as using Dye Penetrant to check for cracks if I was unsure. If there is a crack, the dye will definitely find it.
If you find a crack, no matter how small, the block is junk. I have used all types of external bracing and welding on the inside, bottom line is, if it's cracked, you can not repair it and last for long.
Good news is, Briggs fixed the problem with the Gen 4 and 5 blocks. To this date, if there has been a problem in the bearing pocket area of the new blocks, I am unaware of it. The Gen 4 and 5 blocks also fixed a few other problems,