First thought would be to forget about the blocked cross-over and put two scock intake gaskets on the engine and see if you still have the popping.\
Then the popping is caused by some other part vs the intake manifold seal.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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