Yes it can but the intake is probably the bad guy. General Motors had alot of problems with them.
It can.
around 6-7 hours according to AllData
Replace the manifold gaskets. Answer. Word to the Wise: It would help to know what caused the leak. Bolts not tightened in correct pattern or torque, or just old age? Also, if manifold is aluminum,...
between the head and intake manifold