Does anyone have 4 groves on their crankshaft pulley instead of 3?

As I was trying to set my timing and went to align with TDC and the "Z1" mark that I have read about, I found my crankshaft pulley has 4 groves instead of three. The 1st and 2nd grove are about 1/4 apart, then about a 2 inch space before grooves 3 and 4, which are also about 1/4 inch apart. There are no markings on any of the grooves.

Seems strange as all the advice I have received and reading I have done only talks about 3 grooves.

This is on a 1983 3.0L SC engine.

Anthony Kram

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Anthony Kram
77 Targa

That other groove is something like 5 degrees btdc or atdc. I was way off I jyst whent down stairs and lokked at a pulley it had notches at 15 and 5 BTDC, another one at either 30 or 35 ATDC and the three 180 out one being Z1. So I guess I acn't help sorry. Can't spell either.

[This message has been edited by mackgoo (edited 12-30-2000).]

[This message has been edited by mackgoo (edited 12-30-2000).]

OK, as you are turning the engine over, clockwise ... the marks that will appear, lining up with the notch in the fan housing are:

1. 35 degrees Before TDC
2. 30 degrees Before TDC
3. TDC
4. 5 degrees After TDC

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Warren Hall
1973 911S Targa

Mine has a TDC mark, a 5 degrees before (or after?) TDC mark, and two marks that divide the pulley into thirds. Those marks are TDC for cylinders other than 1 and 4, I believe. Or I should say, I assume.

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'83 SC

Sorry for the GCE on the before and after, made me go back and look at my Electromotive pulley to make sure I got the timming maright for the MFI, that I had to add. At least I did get that right.