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1956 225 hp dual quad. I went to verify initial timing today and was happy to see the previous owner had used white paint to clearly mark the pulley and the degree marker was also very legible. When I used the timing light I saw a second mark about 1.875” away on the pulley. (using my retired math teacher skills and estimated 6.5” pulley diameter, I was able to calculate that the lines are about 33* apart) At first I thought the “extra” line was not “official”, but closer inspection revealed that it was white paint also in a machined slot in the pulley. Since one of the white lines was very close to the 4* BTDC that I was shooting for, I corrected the timing with that line. My question is: what is the second line? Is it a full advance marker? The 4* and the 33* do add up to 37*, which is a good full advance number.
I know this is an old thread, but I am the OP and have a question. 2 years ago I did verify that the 2nd white mark was full advance and did set the timing using it.
Today I'm setting the solid lifters and want to mark the pulley at 0,90,180 and 270. I have all the plugs out, valve covers of, etc. so I really don't want to have to start the engine to answer the following question: Standing in front of the car looking at the engine, which of those 2 white marks would be Zero? "Logic" tells me it's the one one the right. Do I have this backwards? I go back and forth with this decision....
when the engine is turning (clockwise viewed from the front), the "advanced" marker will get to the timing tab first. Since it's marked at 37 degrees BEFORE TDC. So the zero mark would be the one that's to the left of the other mark, viewed from the top front.
when the engine is turning (clockwise viewed from the front), the "advanced" marker will get to the timing tab first. Since it's marked at 37 degrees BEFORE TDC. So the zero mark would be the one that's to the left of the other mark, viewed from the top front.
Just to be clear, this means that you want to use the SECOND or more left mark as TDC.
2 timing marks on pulley
