I was on my phone earlier (small pics for older eyes - LOL), that appears to be a car crankshaft & I can't see any windows/holes in the pistons (which ALL my black case LS's have) in those pics. Thinking it may be an on road engine with a water jacket added, which would mean the timings are different on the cylinder. Please post more pics of the extra pistons from different angles & some of the ex. ports on the extra sleeves. I'll wait on more pics & we can work from there. Still not out, just need more info/pics.