You need math to figure C.R.? Who knew. With the chamber at 64 you're right around 9.2 depending on the valve notches in the pistons.
FC Pilot is dead on. Can those POS projected tip plugs. You going for a smog check or trying out for a milage marathon.
I'd say you you some how managed to detonate #7. Like you said, the rings are probably toast and causing the leak, probably lifted the head enough to blow a path for the water, or, as you said, the manifold was not only not sealed to the outside world, it wasn't sealed to the neighboring water port.
Like GT Jets said, the guides are probably tight and you hung #1. No sure why he thinks it looks queer. Its looks bent and it looks like it was kissing the piston even after it bent.
I guess this class is a great learning curve to racing. You, Shawn, and Marissa, and who ever else are lucky these were SS PS GN or cracker engines.
Just because they are basically warmed up stockers doesn't mean you can assemble one and tune on like the family grocery getter.
GET RID OF THE PLUGS!!!
I think the #7 valve looks like that for the same reason the plug from that hole does. He either banged it pretty good and it came thru the head gasket, or possibly a leak from the water port to the intake port. The manifold gasket may have played a part in the lean burn as well.Probably should have clarified the queer valve violent I was referring to the rusty number 7...hey, isn't that an adult beverage? Unsure
It almost looks as though number 7 was pumping a lot of water....What do the cylinder walls look like?