What is this bevel on the rotor housing called?
 

I'm clearing out some extra items in the garage and found a seemingly unique thing on the edge of a pair of rotor housings. I'm looking to know what it's called so I can call it out in the ad. I know I've seen it in the past, but couldn't seem to find it.

I'm going with those housing have been on a major Bridgeport, or a j-bridge

Yes, relieved for bridge port.

That's rather small to insignificant. Probably because those are for an '86-02 based engine and you can't make a bridge very large without cutting into the coolant groove.

My bridge ports are "small" and they are relieved way more than that. J-bridge ports extend the relief way PAST the water seal and into the water jacket, which is what the J stands for.

I thought the J was for Jumbo.

Nope. :)

http://fc3spro.com/TECH/PORT/auxport.jpg

Damn. that's a serious hole. I'd call that a V-JayJay port.