Checking ignition timing on my truck?

Matt

Active member
1995 Chevrolet K1500 with 5.7 TBI engine. NOT electronically controlled.

I checked the timing and noticed 4 arrows. My book says that it is supposed to be between the fourth and third (to right when looking at the front of engine). I talked to a friend and he said that you are supposed to disconnect something or other when checking timing like the old vacuum advance distributors.

I am wondering because when I checked the timing my timing was SEVERELY retarded and my truck is running like a 2 legged dog.
 
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