I'm curious of the design behind them, I can't seem to find much good stuff on the net. Where do they bolt in, and how does it affect the crank? Thanks

 

A girdle would bolt onto the main bearing caps. All it does is keep everything straight and lined up under high RPM/vibration. This puts less load on the main bearings and keeps them in better shape.

I'm sure someone can offer a more in-depth explanation, but it's a pretty basic part, and I've given you the idea behind it.

Justin

 

Yeah I kind of knew that much, I just wanted to know where it actually comes in contact with the crank. Only thing I can picture it being is like a big bearing. Or possibly it doesn't even contact the crank...

 

nope not even close, it supports the three middle main caps, doen not come in contact with crank it is sandwiched between windage tray and main caps ...go to something like www.z10engineering.com