Hi GT,
I am really curious about this mod. When you do this, do you open up the block deck surface and the head gaskets? Does the flow through the block flow fore and aft or does it still flow aft, up to the heads, then forward? If the flow is both fore and aft to equalize the temp in the cylinders, how does sufficient flow cool the heads around the center cylinders if the flow enters the block in the lower center, flows forward and back, up into the heads, and out the four corners? If the flow is in through the bottom center of the block, flows aft and up to the heads, and forward to the front corners as it also exits the rear corners; how do the front cylinders cool and is there enough flow to the front of the heads? Do you restrict the water leaving the rear of the heads?
Thank you in advance,
Joe
The water flow on that deal was completely vertical. The head gaskets were not modified at all, same 3/16" holes for the water to enter the heads.
There are two water outlets on every big Chevy, small Chevy, big Ford, small Ford head and that include MOPAR also.
The intake manifold blocks off the two rear water ports. We drilled 3/8" pipe ports in the rear of the intake manifold (RPM Air Gap) and used the factory water ports on the front of the intake. It went to a log of sorts with four ports with a valve on all for ports and that went overboard, the valves were drilled so they would not close all the way, yes, they were half inch gate valves...
We could balance the water flow out of the engine with the four gate valves to get close to the same temp out of all for corners. It worked great and eliminated the sand trapping issue we were fighting. Low water conditions would fill the block with sand in a virtual heartbeat.
We had to drill and re-thread the block drain holes to 3/8"NPT, that for me was the only sketchy part.
The water entered at the bottom and exited the manifold, no water entered the front of the engine and the thermostat hole was a flat plate with a pressure gauge in it.
GT
