How to time a 350 chevy with a big cam7/31/2023 ![]() ![]() THE cam gear rotates exactly once for each two times the crank rotates,the cam gear lines up at the 12 o'clock crank and 6 o'clock cam gear orientation when the #6 cylinders on the compression stroke, rotate the engine one complete revolution and the cranks again at 12 o'clock but the cam gears index mark is now at 12 o'clock, indicating the #1 cylinders at the compression stroke, you use the 12/6 index to install cams simply because its easier to align correctly ,visually, but you need to rotate the engine to the 12/12 orientation before dropping the distributor back in, the distributor won,t fully seat unless the oil pump drive shaft seats up into the distributor gear, as you remove the distributor the helical gear interface tends to turn the pump drive shaft slightly, you can use a long flat tip screw driver to turn that back to the correct location and with a bit of practice you'll learn to gauge the amount the rotor rotates as it seats into the cam gear.
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