gmc 366 big block question

Have a 1990 gmc topkick with a 366 big block. Want to change the oil but don't know the oil capacity of it. Looked online several times could not find it. Coming here for all the answers I can't find anywhere else.
 

peteo1

PlowSite.com Addict
Location
Erie, Pa
Why not call a GM dealer instead of listening to a bunch of guys on the Internet who aren't all that sure. Just because I'm a good sport I'll play too...start with 7 quarts and go from there
 

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