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-   -   496 mag ho suspicious performance (https://www.offshoreonly.com/forums/general-q/379500-496-mag-ho-suspicious-performance.html)

Outlawmarc 06-10-2023 12:13 AM
Originally Posted by Velocity941 (Post 4870166)
496 will idle like a kitten and run smooth on 7 cylinders. Check for spark at the plug with a spark tester. Coils go bad and spark arcs to valve cover. Won't show up in a scan... good luck 👍

i did test for detonation on each cylinder


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