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I have an 87 TPI Trans AM 305 engine. I still have the factory emission sticker under the hood. It says the timing should be set at 6 degrees BTDC. I've been testing at different settings. It would seem that the engine would prefer 4 degrees for more top end power. And, 8-10 for more low end torque. Remember, when setting timing, the higher advance = less top end but more torque. And the more retarded is exactly the opposite. So try to find a balance.

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Q: What is the timing setting on 305 motor in a1986 pontiac's trans am?
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