SOURCE: 89 gmc
I time these engines at 4 to 6 degrees BTDC. If there is timing chain wear or if it has higher mileage, I go to 8 BTDC. The extra degrees help with the timing chain stretch.
SOURCE: Were is the connector to disconnect for ignition
You have to disconnect the brown wire thats on the firewall. It disables the computer controlled advance and allows you to set the base timing. Disconnect SET TIMING connector (tan/black wire) located in harness close to distributor. DO NOT disconnect 4 wire connector at distributor.
Thank you for using fixya and good luck, set timing is O".
Fig. Fig. 2: EST bypass connector
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