Sounds like the rings have not seated in yet or one is broken. Put the head
back on ( you can use the old gasket ) leave the rocker arms off, then pump
air into each cylinder. Either rotate the motor to BDC or stand clear when you
apply air. A leak down test tells you much more than a compression test. A
compression test tells you there is a combustion chamber leak, but a leak down
test tells you where the leak is.
It is normal to have a hiss past the rings and on a high mile motor slight
exhaust valve leakage. Even slight intake valve leakage will greatly reduce
power and there should be zero leakage in to the cooling system.
To test for cooling system / compression leak without having water in the
system, seal off the coolant hoses then put a latex glove over one hose port.
if
it inflates there is a leak. This test might not be valid if the used and
reinstalled gasket is in poor condition.
Harold
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