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  1. W

    Spark knocking diagnosis

    I have a 1995 mercruiser Weber 9770s carb 5.7 mag alpha one gen 2 combo with the thunderbolt 5 ignition original engine serial number 0F423587. I had to install a new engine this year because the other one blew the head gasket and ate a gutter between 3-5. I went with a new vortec and i got it...
  2. W

    Replaced engine now no spark

    I have a 1995 mercruiser carb 5.7 alpha one gen 2 combo with the thunderbolt 5 ignition original engine serial number 0F423587. system, that I recently replaced with a vortec reman unit because of a gutter that was created between cylinders 3-5, Before I realized the actual issue with this boat...
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