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Synthetic or conventional oil for my 84 Cubic inch Bonneville Chief

Greg Erickson
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Joined: 3 years ago
Posts: 4
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I am putting back together my grandfathers 1941 indian Bonneville chief. I am running a new set if Kiwi cases that accept the 80 inch flywheels and the pistons were already .060 over when I got the bike. I am running a constant velocity carb from a 80 cubic inch H-D soft tail on a custom intake manifold that I made from stainless steel. When my 4 speed over drive transmission arrives, it will be going back together. Any suggestions or opinions on synthetic or conventional oils in the engine as well as the rest of the bike?