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Moroso GM valve cover adapter that accommodates a COPO-style breather in GM valve covers. This adapter allows use of that breather arrangement where the valve cover’s breather provision is required, providing a neat, purpose-driven solution for GM engine installations that incorporate the COPO breather location and retain proper crankcase venting.
Moroso GM Valve Cover Adapter (w/COPO Breather in GM Valve Cover)
