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16:1
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16:1 for sure. Ignore all the hype about “today’s oils being so much better, you need less” on this engine. This engine has “plain bronze” rod bearings that require alot of lubrication. If the rods don’t get the lube they crave, you will end up pitching a rod probably through the side of the block. The great thing about these engines is when they are in good tune, they hardly smoke at all, even at 16:1
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1/2 pint of oil for each gallon of gas, or 16 to 1. This is also true of most OMC engines from the 40’s and 50’s. My 1955 Johnson 5.5 takes a 16:1 per the cowling instructions, and I would think that this would also be true of the ’57. Running a lean oil mixture will cause more damage to the motor than the lack of smoke will benefit.
"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."
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My ’55 had Champion J6C spark plugs on it, which is around 0.02 to 0.03 inch gap.
"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."
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