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motor
im trying to help a friend out,he has taking his off before it was properly aligned,and have been told the way he put it back together ,with the chilton book is wrong,or 180 degrees off.
my book said #1 piston at tdc,#4 firing and timing marks at 6 oclock on the cam,and 12 on the crank,
but i have been told the gmc manual for this is 180 different./#1 at tdc,#4 firing or compression stroke,and gear marks at 12,and 12.
so we are trying to find which one is right before putting back together
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