Here is the damage. It looks to me like some casting lines on the water jacket side of the #2 cylinder wall caused the crack. The cylinder wall measures about .175-.195". So with the 5" of un supported cylinder wall they were moving all over and the casting line made the cylinder wall a little thinner and had stress risers, thus the crack.
It looks like the #3 and #4 were doing the same thing. The pistons have cracks where the piston skirt blend into the wrist pin boss. The Rod bearings have seen better days, but they were standard Kings, I will be running ACL race series with a special coating with the new motor. The main bearings look great, and the oil pump/front cover is junk after 300miles.
It looks like I am getting air in the oil, so I will be doing some oil control around the crank and oil pan, and I will port the oil pressure releaf hole a little more.
Now I have the parts needed to put the hard block in, then I need to make a parts list then start machining.
~John
Threaded Mode