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BAD THING! The 074 heads don't use the heat crossover and it is a dead end and does not go to the water jacket. Your heads need to be pressure checked. Should have no water. The head bolts in the ZL-1 block are blind-they don't go into the water jacket and only require oil on the threads. The 4 extra head studs go into the 4 intake ports and need sealant-do not use silicone it is not gas resistant. Man, these ZL-1's are different animals.
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Greg, your NOT making my day..it seems that the flow thru the water jacket isbeing caused by a somewhat large hole..never builds pressure just blows air out...no water in the oil but then again the motor only ran to operating temp once..looks like I may pull the heads since the motor is out and look more closely at this problem..thanks for the input..anyone else care to guess comment on this..really getting frustrated now!!
