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Sorry for long to get back. I will have to try it like that. Could the low voltage be the electronic brain box mercrusier uses failing athigh heat?

I tried with the jumper wire from the battery to the coil no change.

7.9 v at the coil when its doing it will let it cool then try what you said with the jumpers. Will it work to go from the battery instead of alternator? Very hard to get to the alternator where its...

This is mercruiser version of hei. Has a sensor in the dizzy and a box that controls spark curve. Thunderbolt iv is what its called

This issue began from the beginning. Thats when I had the edelbrock carb on it. I switched to the stock Rochester and it solved it until I put it in the lake. Thats also why I'm questioning if I...

It does have a thermostat. In a boat they tend to run cooler a lot with 140 degree tstat. Are you thinking bad alternator?

The way it backfiring could there be something with the timing or my adjustments on the rockers are off? No matter where I put the timing it has the issue.

I pulled the fuel lines as far away from the block as I could thinking that. Could it be vapor locking inside the carb? It did the same with an edelbrock carb i thought it was something wrong with...

I built a 350 with fairly aggressive cam edelbrock intake and standard heads for my boat. When it gets to operating temp it refuses to rev past idle. Sits and makes a chugging sound. When it does...