timing at 30 BTDC?!?!?!?!?!?!?!?!

yup....weird...is that even possible???
mech advance only, 800 rpm....i checked the balancer mark when i had the heads off and #1 at TDC, and it was dead on 0.....and yet the timing indicates 30 BTDC at idle.....
it starts easily and quickly, and runs great......