From what i understand the coolant through the spacer is designed for 2 different things.
1. To warm up the engine faster in cold operation
2. to cool down the incoming air and manifold when hot because the EGR valve is mounted on the other side, which exhaust gas is ALOT hotter than coolant. The coolant takes away the heat from the throttle body and circulates it back through the system.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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