I was advancing the timing yesterday and realized that I can not read the markings on the timing tab at all. I have trid my hardest to clean and scrpe my way down to them, but with no luck. There is one notch that is cut differently than the rest and I am assuming that it is TDC, if anyone else has an '86 LG4 and can tell me what degrees the other notches are at, I would greatly appreciate it.

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'86 IROC-Z, 305 LG-4, T-5, T-Tops, 50k Original Miles, K&N Air Filter, Jet chip, KYB Shocks/Struts, Centerforce Dual Friction, B&M Ripper Shifter, Hooker Super Comp Shorties and Y-pipe, Catco Converter, Flowmaster 80 series, 3 inch custom exhaust

 

btt

 

Yes, the biggest notch (or valley) is 0*. Then, proceeding to the passenger's side, the first peak is 4, the next peak is 8, then 12 degrees BTDC.

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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

 

Thank you very much.