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03-23-2006, 07:26 PM

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mwdill

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spark plugs for 496 HO

time to replace the plugs, but want to know what anybody else has tried, anyone try the NGK? has the Denso's in it now.

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03-23-2006, 09:10 PM

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Hydrocruiser

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Re: spark plugs for 496 HO

NGK's in many Mercury applications will give the absolute best idle performance and prevent carboning problems. Things may be different now with the new ECM's. I put a set of Split-Fires in and it took all season to figure out why the engine was acting up. Split-Fires are a no go Houston.

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