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and why would you want to run anything close to 20 degrees initial - unless he is running a very big cam and has vacuum issues. With that much initial ( even if the engine could tolorate it )you are just asking for hot start problems.

16 to 18 degrees initial no problems on my low compression pump gas motor, it doesn't like 20 degrees initial, especially when hot

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)