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I don't know for fact, however, if you cannot find it under the hood somewhere, on a sticker, then, I would just put it at, say 4 degrees before top dead center, or advanced, and go from there. On an older vehicle like that what they say to set it at, and what it has to set at, are two different things. It may not run right at the figure they give, due to todays gas qualities, and maybe a little bit of carbon build up on the top of the pistons which ups the compression ratio further. I would start with it about there, and if it doesn't ping, run-on, or crank slow when it is hot, leave it. Your altitude will factor in as well. I would bet that they recommend 4-6 degrees advance, anyway.

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15y ago

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