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manley valves??
does mercury use manley valves in the 502 mag mpi??
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Re: manley valves??
I do not think so. I believe they a factory GM valves.
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Re: manley valves??
you are right, the 454 mag mpi and the 502 mag mpi use a stock valve, you have to step up to a blue motor to get the good valves
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