TDC mark 91 S-10 Blazer

[Rob_0126]

My marker has 3 pointers. Which is TDC? I cant for the life of me figure out why GM didn't just mark the blasted TDC with a zero.

I keep getting conflicting answers on another site so I want the exact truth because I dont want to overtime or undertime my engine.

Pictures would help a whole lot.

thanks :)

[1993blazerlt]

the 0 mark is the one with the largest depth, it is pretty close to the probe hole, just be carful there are two marks on some of the balancers

[Rob_0126]

the 0 mark is the one with the largest depth, it is pretty close to the probe hole, just be carful there are two marks on some of the balancers

yep, mine has 2 marks; Why?

btw, I cleaned up the marker and it actually has the timing numbers :)

Mine was on 2 btdc. Runs better now on 0.

If you would host a pic I will draw one out so everyone knows exactly what tdc is on these.