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Best Plugs for 454

Old 06-18-2009, 10:49 AM
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Default Best Plugs for 454

Hello Everyone,

I just joined this forum and wanted to find out if anyone knew which plug is best for the 454 mercruiser 7.4 with rochester carb and after market mainifolds on a 1990 27 foot switzer race boat. I bought the ac delco r43t and the boat ran hard. Was interested to know if any one knew if i should run the NGK Br6fs plug and would it be the better choice.

thanks,

Last edited by frantic; 06-18-2009 at 02:55 PM. Reason: Or is there any other plug that someone has a recommendation on?
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Old 06-18-2009, 10:59 AM
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I have used them all. Right now I use the AC Rapid Fire. A little more money.
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Old 06-18-2009, 01:18 PM
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Using the NGK BR6FS right now without issue, but did not have any issue with the MR43T either. Just changed cause someone suggested.
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Old 06-18-2009, 03:05 PM
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Unhappy 454 plugs

I thank all you guys on the recommendations, it's great to know. I tried the ac delco iridium but they were horrible and the engine flooded and my plugs were burnt and shot up. Ac r43t are working like a charm and wanted to know if the NGK's or the rapid fire #1 were any better. Did not want to have the same issue I had with the iridium ac plugs. It was scary especially being at hell's gate by the east river.

Thanks again.
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