427 gmc c-6500

ok maybe some of you guys out there know the answer i'm lookin for cause i can't seem to find it on any websites yet....... any ways have a 1988 gmc c-6500 with a 427 in it... i'm lookin for what the timing needs to be set at.... i can play by ear but it still wants to disel when i turn it off and sometimes it disels enough it will actually reverse the direction of the motor... any help is greatly appreicated


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My information says 8 BTDC . I would look for too high idle or a lean condition .

Also try changing brands of gas,My 85 would diesel on one stations, but not on another.
Shane

thanks for the fast reply like i said i've been searching and searching and all it brings up is vette motors i will give that a try