Degree a camshaft.

Ask him what the intake centerline (ICL) was, as he installed it and measured it with the degree wheel. A 106 installed ICL would put this cam timed with the 4 degrees of ground-in advance. If he really installed it 1 degree retarded, the measured ICL would be 111 degrees.

(And not to confuse things but to be complete in explaining, ICL is measured after top dead center of the exhaust stroke... ATDC.)