Hi; 1988 through 1995 is 4 degrees BTDC 1996 and later is electronically controled
you should set it at 0 degrees btdc
The answer should be in your owner's manual in the last few pages near the back.
Need to know what year and if it is a standard or automatic transmission.
Automatic transmission - 10 degress BTDC Manual transmission - 6 degrees BTDC
I would set it at 10 BTDC with the distributor vaccum unhooked while setting timing. 10 to 13 degrees is what the factory recomends.
It's 4 degree BTDC ... A computer controlled distributor on SBC engines is set at 0 degrees. There is a special procedure for setting the timing on computer controlled distributors. Consult the Chilton or Haynes manuals for specifics.
The timing setting given is the most common for the 327. If, during a test drive, the engine seems a little sluggish, you can move the timing up two degrees to "6 BEFORE." If the engine clatters when you accelerate, move the timing down towards the "0" by two degrees.
On an older vehicle like this , would start at 10 degrees BTDC; vaccum line to distributor plugged while setting timing.If it pings, back it off 2 degrees, if it does not ping under load, add 2 degrees. According to the repair manual timing should be 8 BTDC (6 degrees BTDC for calif. emissions and high alt.)
Ignition Timing degree B.T.D.C at idle speed 20 degree plus or minus 2 degree
Zero degrees at 500 rpm with vacuum advance unhooked and plugged and transmission in drive.
1970!!! Geez... "0" degrees I think. Better call your local auto parts dealer and ask to be sure.
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