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Because the timing pointers are rarely accurate and that timing chains vary in stretch or lack of it, we adjust that cam by ear. It's a bottom end cam, probably the best grind ever for a truck or even a car stoplight to stoplight, which has a low rpm, smooth idle. You'll know when it is right if you listen. Our final adjustment is the highest idle RPM at which it will still bump start. You can find this in a few tries with someone in it who can keep test starting it. If it starts with just a bump of the starter and idles good, advance it a bit more until it balks and back it up to the last place it started instantly. You're closer than a light will typically get you. To verify start at 10deg BTDC and do the procedure. Once your ear and the starter is satisfied check to see where the timing ended up and note it, maybe with chalk or some other marker on the indicator. It could land anywhere from 14 before to 9 before. But timing indicators aren't precision, so if it runs and starts right, it is right. Once marked you can use a light next time, unless there are a lot more miles on it and the timing chain stretches some, which is predicitable. good luck Duntov

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