TestDrive - if you have a DOHC and a SOHC, you should count the teeth on both.
One of the DOHC's gears may interchange with the SOHC. (The DOHC will have 2 gears that are both a 2:1 ratio to the crank, for those who would argue otherwise.)
So if the SOHC and the DOHC both have a 18 tooth crank gear, then they'll both have 36 tooth cam gears, the only difference is the DOHC has 2 of them.
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