i would ask you to have the heads bolted on the block before you have it pinned up, if you dont when you torque your heads on it ,it could open up the repair,when installing the pins put a little JB weld on the treads and tighten up,if done right it will never leak water, i have done more than my share of repairing and i didnt want to have problems after spending alot of time repairing cast iron,just my opinion.dan
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