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Re: timing mark keeps moving on race car
check or tie the vacuum advance plate off to ensure it's not moving normally when in use there is vacuum to the plate which holds it steady with the vacuum line disconnected it may be vibrating at high revs and causing the erratic readings. Or to do a quick check apply some vacuum to(hand held vacuum pump or have someone suck one the line will you check) it the timing will change but if it stays steady then you'll know for sure.
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