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Found it!! Replaced water pump, drilled bleeder hole in thermostat, added another electric fan for increased cooling air, watch carefully for out-gassing in water (nothing), and same results again. Just for s#!+$ & giggles shot the temp gun on bottom tank of radiator at 103* and top was 195*...

Raising the front of motor would trap more air in front of block as passages to head start between front two cylinders. Seems like close to level would be best to evacuate air from system. Still not sure if bypass hose is allowing too much water to flow directly to intake which would reduce...

Timing set to 12* initial w/32* max. Removed thermostat with same results (as above). No old freeze plugs in water jacket area. Both top & bottom hoses are getting hot as it warms up and radiator has heat too. Temp gun shows warm-up as normal then it flashes to 212*-215* after 8-10 min. What am...

Edelbrock head gaskets only go on one way with water flow from block to head in back, intake only flows water from head to intake in front. No thermostat to restrict water/air flow. Run-in stand has large/good radiator w/electric fan well above intake manifold. Engine sitting slightly high in...

Just finished up assembly of original 69' 340ci +.040 10.5:1 and running on run-in rack. X-heads, Edelbrock Performer w/650cfm spread bore and 292/.508 hyd cam. Sounds great and runs for 10min then boils over and pukes about a gallon of water out. Heat cycled twice and re-torqued heads...