Yes, I have mine dump right into the extra fitting on my Stainless Marine exhaust manifolds.

cool will do that during this rebuild.

IMHO This thread contains some very bad information and mis-direction. There are way too many variables to the question "Rear Crossover on intake manifold". Let's assume that a BBC is the motor in question. Variables:
1) Block generation
2) Head Model/manufacturer
3) Head gasket manufacturer
4) Crossover or recir pump
5) Any modifications to any of the above

What I see in the thread is a "cookie cutter" approach to water circulation and distribution. Simply does not apply here.

Ok, I have been reading this thread and I'm thinking about doing it. Gen4 427 .60 over AFR 265CNC heads, 10.5:1 comp. Stainless marine GenIII exhaust, Weiland Stealth intake, No circ pump, but a crossover with bypass, steam holes drilled? Engine has yet to be painted or installed, Should I go ahead and do the rear crossover with a T, just in case I have pressure or steam issues, I'm all about doing what I can to extend the engine life, and reliability.

All it needs to be is a dump for steam Air pockets to get out small lines -4 if you go to big then the t-sat will not work right if using one.

I installed a rear crossover but i ran my #6 lines to the front of the intake manifold. I also have a crossover with a bypass and a 140 thermostat with 3-3/32 holes in it. Engine water temp. stays right about 140 and water pressure at cruse about 18lbs.

did you run one for each side?

Yes. I also checked the temp of the heads with a infered thermometer and they were withen a couple of degrese.

have any pics?

Im not shure how to do that. It says may not post attachments.