Like mark said the normal timing is around 14° but since every car and setup is different you need to do a little trial and error. Start with the timing at 14° and drive the car around. If it pings (a sound of rocks shaking in a coffee can) then turn it down a degree or two. If you dont hear pinging then you can try going up a degree or two. For the most part you want it as high as can go without pinging. Some guys set theirs as high as 16°, and 10° is what its set at from the factory.