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Spark Plug Preference

Spark Plug Preference

Old 08-08-2018, 09:15 AM
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Curious what heat range you all are liking on N/A BBC? I have 735HP 572's with Edelbrock 355CNC heads....NGK? Champ? Others?? Thanks, Tim
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Old 08-08-2018, 10:14 AM
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Have had excellent luck with ngk v power over the last 20 years 11-1,10.5-1 and 9.5-1 compression BBC's, also run them in my supercharged seadoos and canam atv's

i run 7's mostly unless the plug reads hot or fouls

Last edited by Wobble; 08-08-2018 at 10:17 AM.
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Old 08-08-2018, 10:33 AM
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We ran NGK - 11 in my Blown Alky motors (very cold) so 7 must be "hot"??
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Old 08-08-2018, 12:05 PM
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An NGK 6 is equivalent to and AC 43 which is stock for Merc NA engines.
An NGK 8 is equivalent to an AC 41 which is stock on older Merc SC'd engines.
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