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My ZL-1 set over a year after dyno time. It leaked water up thru the head bolts. Lots of water. The builder told me to go to my Gm dealer and buy tablets that go in the rad water. It took 6 times before it sealed. Runs fine now. I changed the oil 6 times before it quit. Just giving info to watch for on these motors. Kim
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got back from picking up the motor..maachinist stayed on it till 2 AM to get it back together..disassambled, cleaned, new bearings. Its back in the shop awaiting new gaskets and a install on Monday..then
had the problem with the bolts..fixed that..but when I blow air into the crossover nothing comes out the exhaust..nothing!..it all goes thru the water jackets..almost as if its set up a coolant passage under the carb..good thing??bad thing??
.was planning on sealing the crossover area with the block off plate that comes with the intake set so it should be sealed anyway.
Albert
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A 074 head unless someone has modified it has no passage, A good common practice is to pressure check a engine before installation. I highly recommend it.