put the dampener slit to TDC on #6 compression & preoil one bank then turn the dampener back 3/4 turn CCW (guestimate or cut a strip of paper 17.082" to use as a ruler) then preoil the other bank. I like to get it on #8 first during assy then preoil then go forward to the slit for #6 then I just have to back it up slightly to 15 deg to set the timing all of which minimizes the amt the camshaft being turned.