i cant read any numbers on the tab.

[This message has been edited by buddycraigg (edited 11-20-2006).]

someone posted a nice pic of one awhile back, like march-april. I'm trying to find it.... it was in someones build thread, like that narrows it down

[This message has been edited by tjm4fun (edited 11-20-2006).]

spray the area with some carb or brake cleaner the tab may just be gummed up.

Buddy - I have this pic if it helps. Each line is 2* and the markings are stamped every other one, I.E. 0-4-8-12. The unmarked lines are 2-6-10. My pic shows the crank at almost zero and the paint mark on the tab is 10*. Hope it helps.

Tell me something. That tube by the timing tab is used for what.
Don

that was some silly special GM tool that fit in that hole.
i think it was magnetic and would trigger when the groove in the ballancer would go by

most shops stopped using them in the 70's. i dont know why GM kept putting them on there

[This message has been edited by buddycraigg (edited 11-20-2006).]

quote Originally posted by buddycraigg: that was some silly special GM tool that fit in that hole. i think it was magnetic and would trigger when the groove in the ballancer would go by most shops stopped using them in the 70's. i dont know why GM kept putting them on there

Some modern equipment still use the magnetic pick up today. It is used for checking ignition timing and reading engine RPM.
Many dyno machines still use it for reading accuarate RPM's mainly on cars without ECM.s. It's not just a "GM thing" Ford and Mopar had them as well.

[This message has been edited by Oreif (edited 11-20-2006).]

Woohoo - I got a rating bar. Thx for the plus. I did'nt think I'll ever see it. Just hope it stays green.
The engine is clean cuz I took the pic when I rebuilt it.

quote Originally posted by Oreif: It's not just a "GM thing" Ford and Mopar had them as well.

Oh, well i try not to work on them

Just another angle