what do you mean silcione around the head? maybe I am not reading this right but do you mean between the head and block?
if it were waterpump related it would be leaking out the weep hole....generally
When you pressure tested what did you find? Do you have white smoke out the exhaust? Are you sure you got all the air out of the system?
Possible clog in the heater core?
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1991 Nissan B13 Sentra sr20det 300whp/1991 Nissan S13 240sx sr20det ~260whp
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