That would be the biggest and widest mark. Are the first mark on it when turning it clockwise to the pointer.
The timing marks are on a tab adjacent to the harmonic balancer.
On the front of the timing chain cover, drivers side towards the top of the harmonic balancer.
The timing marks should be found on a little metal plate directly above the harmonic balancer.
If you look at the harmonic balance you will see on the front of it a medium size circle. That will be your timing mark.
there will be a timing mark on the harmonic balancer. and a timing tab on the timing chain cover. point your timing light at the timing tab and you should see the timing mark on balancer. if not timing is way out.markstang.
4 degrees btc-before top dead center with the vacuum spark line disconnected.the timing mark location is on the harmonic balancer. this is for a 327 engine
line up timing marks from harmonic balancer and timing tab on timing cover
There should be advance marks on the harmonic balancer, and timing marks on both timing chain gears.
It is possible that the harmonic balancer has spun.check the rubber around the balancer for cracks or decay.If so replace balancer...
buy a timing light. clip it to the #1 plug wire. loosen the bolt on the distibutor. Unplug the timing advance. start the engine Point it to the harmonic balancer and turn the distributer until the timing mark on the timing cover lines up with the mark on the harmonic balancer. Tighten the distibutor bolt. plug in the timing advance.
it is located on the harmonic balancer outer edge even with the crankshft "key"
The easiest way is to look at the Harmonic Balancer. The 305 has a wider thicker balancer than the 350. Pus the timing tab on a 305 is located ON the timing cover and the 350 is bolted on the with the cover bolts. Riky9