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Before, and it really depends on what you are calling "modified" if you put a "hotter" cam in, sometimes the stock timing won't do it justice. You have to play with the timing and see what works best. Usually, advancing it 1 or 2 degrees gives the best result.

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18y ago
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Q: What is the timing degrees on a 351 modified 10 degrees before or after top dead center?
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