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    Thunderbolt IV 454 Timing Issue

    I have an unusual timing issue, I found a post with a very similar issue on another site, someone said it was normal, but it's a new issue and does not seem normal. The suggested resolution is replace the distro with an MSD...
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    Metal on metal engine sound at higher RPM

    Hi Everyone, I put a new motor in my boat this year, after doing it last year and having that one lose oil pressure by the end of the season. It’s a 1983 mercruiser mak IV 454, 4 bolt main (370 cyclone) engine with a TR drive and BW transmission. Its stock, thunderbolt iV ignition and has an...
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    Mercathode Controller Blue vs Black

    I cant seem to find a clear answer on this.... I understand the black controller is the least powerful and is intended for the system with the two pucks on the transom, the blue controller is more powerful and intended for the gimbal mounted anode. So the question is, can you use the blue...
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    Carb Change / update and sight flow tube

    Hi All, So I read this thread and now realize what the yellow line is for: http://forums.iboats.com/mercruiser-i-o-inboard-engines-outdrives/merc-5-0-stalls-when-coming-off-plane-559146.html My question is - I am updating my carb and the new one does not have a provision for this line...
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