If it is a distributorless ignition system, you don't. The timing is all handled by the ecm. It picks up the signal from a crank sensor in the block. It has a reluctor wheel cast in the crank.
It has adjustable rockers.
On a 1989 Chevy Celebrity the timing is controlled by the engine control module, there is no specification or provision for adjusting the timing manually.
how much play should a 4.3 Chevy engine timing chain have?
it does not have a distributor , it has coil packs
you can't it is controlled by the computer.
How do you set the timing for an 1989 Chevrolet G20 van - 350 cu. in. with tbi?
There is no adjustment to my knowledge.
4 DEGREES BTDC.
165432
The timing is adjusted by the three bolts that holds the injection pump. The holes in the pump are slotted.
It is self adjusting on a 89 Cherokee with a in line 6 4.0
1-2-3-4-5-6