What is a spun shell? 

Excellent video, very clearly explained - thank you

This video deserve's a lot more views.

My R35 lost oil pressure start of the week 160 miles from home and that was a fun day.. I used to be in the tuning trade and life would have been easier with a ramp had i still had a workshop. But found your videos when searching to see how the motor might be removed on the floor at home. I've priced up the parts for a full replacement of the pump, crank pistons rods gaskets shells chains etc and it's probably coming in about 6k to do. Hopefully thats all it needs as that's about half the price of chancing a used motor and will end up with a refreshed forged motor. Mines a 2010 with 112k miles on, I'll be interested to try see if I can identify a cause of mine. Good luck with your build, just make sure you get every piece of swarf out of every nook and craney or you'll end up in the same place again!

Good video buddy