I almost hate to mention this.
If you have a radiator hose to bust or a radiator to leak, where does the coolant go in the engine compartment?
Murphy's Law says exactly where you don't want it to go.
GM put the PCV air cleaner connection on top for a reason.
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"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."