Mine have 3 notches close together, the center one is bigger. Then off to the right is ONE more big one (not 2).

The single one all by itself is TDC, & it's usually painted white. The paint doesn't usually last 15 years... That's the one you use when you're checking camshaft timing.

The other 3 marks are for spark timing. They're at 16 (+/-2) degrees BTDC. Usually painted red, but...

So I bump this thread, hoping someone who owns an '89 might know why there's an extra mark??