You can't it is nonadjustable, The timing is controled by the computer. And there is no reason to adjust it unless you had the distributor out of the engine and in that case you will need to turn it by hand enough to get it running, and that is called the base timing. Then you will notice that the check engine light is on and you will need an OBD2 engine scanner hooked up to the truck and then go into the timing mode and ajust the timing to factory spec. and the scanner will let you know when you have the timing correct. The check engine light will go off when you have the timing right. Then the computer will do the rest.
To set the base timing on a GM 4.3 Vortec engine with a non-adjustable distributor, first, ensure the engine is at operating temperature and then turn off the engine. Disconnect the tan/black wire from the diagnostic connector to put the engine into base timing mode. Restart the engine and use a timing light to check the timing mark on the harmonic balancer against the timing tab; it should be set to the specified degrees (usually around 0° for Vortec). If adjustments are needed, you can rotate the distributor slightly until the correct timing is achieved, then reconnect the wire.
You can set it good enough by ear to make it run. But to get the timing right you must use an OBDII engine scanner. You can no longer use a timing light.
You have to use a scan tool and set it plus or minus 2 degrees of 0
There is no more timing marks for a 98 vortec you have to go off marks on distribitor & use a scanner. You are setting cam timing
Regardless of the block, you have to use Vortec heads to use a Vortec intake.
When timing the timing belt you use the mark for top dead center on the crank. To do that you will have to do a few different steps.
To mark in After Effects for precise editing and timing, use the "Mark In" shortcut (I key) to set the starting point of a segment, and the "Mark Out" shortcut (O key) to set the ending point. This helps you accurately trim and adjust the timing of your video clips.
the 4.3 litre vortec V-6 is a pushrod engine. the camshaft is in the middle of the block, and it pushes rods that open and close the valves in the heads. it uses a timing chain to to turn the camshaft. so it has a timing chain
the timing mark on the crank goes down matches with v notch intake and exhaust both go up but be sure you use the intake mark for and exhaust on that gear.
The timing on that engine is controled by the computer. You can not use a timing light. The only thing you can do is move the distributor enough to get the engine to run and have power and that is called the base timing. When it does run and the engine light is not on then you got lucky, but if the check engine light comes on, then you will have to get an engine scanner and hook it up and go into the timing mode and move the distributor until you get the cam and crank in time. The scanner will show you when it is in time and the engine light will go off. Tighten distributor and your done. The computer will do the rest.
On my 2000 Metro with a 1.3L the mark and slot marked with the "E" are used.
It is on the front of the engine, behind the timing cover where the timing chain and gears are. You will have to remove the front of the engine to get to it.It is not in the oil pan were they use to be. It now slides over the front of the crankshaft.