That motor looks a lot like the 500 I am putting back in the KOS Demon. My B1 heads have a water outlet between the center ex ports also. Goes to the suction side of the Indy reverse flow /CSR water pump. Single stage fogger on 10-1 CR. Nice job getting 900 on pump swill. You guys didn't spray it?
Question on using pump gas and NOS - do you use pump gas for the NOS system? I want to change the car's plumbing from a separate tank/pump for the NOS and just use one regulator for both the carb fuel and the NOS fuel. Doing that what size main fuel line to the regulator to support the carbs and the NOS? I think the carbs are an-8 and the NOS is AN-6, with AN-10 from the tank/pump. Doing it that way I would have to dead head the regulator as the only remaining port on the regulator is for the fuel pressure gauge. I am guessing the motor will make around 600 on the motor, and I have 250 HP jets installed for now.
You should have a separate regulator for the nitrous solenoid. One for just the motor. Run your main feed fuel line to a log w/ 2 regulators on it. I'm assuming you have a big pump w/ the bypass line from the pump to the cell.
I'm surprised your Demon had two fuel systems on it. I figured he'd have had one big pump to feed it all.
FWIW...I've heard a lot of horror stories about spraying w/ pump gas. Especially w/ bigger systems. I switch to race fuel when I'm gonna spray mine. Sure it can be done, but leaves a lot of power on the table b/c you have to take so much timing out of it.
A 500" B1 motor ought to make a lot more than 600 hp unless you used a cut down broom stick for a cam.
BTW Wade...you did an awesome job on that motor...it is a beast!!!