8 degrees.
check the emission decal on hood or radiator support
there should be a engine decal on the radiator shroud it will have the directions on how to install the serpentine belt the engine size should be on this decal
The drivebelt routing decal on the radiator shroud to help during drivebelt install
Some might think the Chevy decal resembles a cross or the small letter t. The chevy symbol is sturdy and would be a thick t or cross that is recognized most anywhere and by most anybody.
I too have a 87 blazer and are currently working on my timing. Chiltons says to have 5 degree timing in it although it has little detail, if you get a book you might want to get a hanes. hope it helps Is there no decal under the hood telling you what it should be? My '86 2.8 Chevy timing is 19 degrees BTDC. I don't know why there is so much difference between vehicles and the years. I'd think all 2.8s would be the same timing?? cheers.
There should be information regarding the timing degree on a decal locaded under the hood.
There is a diagram under the hood on a decal
Look under the hood for a decal listing the specifications.
you don't the ECM will do it for you. xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx You need to set the base timing on any car/truck that has a distributor. There is a tan/black wire that is usually under the dash down low on the passenger's side. This is the Electronic spark timing and the connector has to be apart to set the timing. That will put the computer offline while you set the timing to the specifications. There is usually a decal under the hood. Once the timing is set then reconnect the connector The base timing is set NOW the computer will take over from there.
You did not say if it is manual or automatic. In the glove box is a decal that tells everything on your truck. You can call the dealership and he can decode it for you. The decal is referred to as a build sheet.
10 degrees BTDC ( unless engine compartment decal shows different )
The drivebelt routing decal on the radiator shroud to help during drivebelt install