From an earlier forum post:
According to Bill Williams there are 3 sizes of radiator cores fitted to the A7: 14.5" 1923 - 1926 (mag engine), 16" 1928 - 1931 (early coil) and 17.75" 1931-1934 (box)
So the early Chummy type is the smallest.
(Note these are core sizes only, excluding top and bottom tanks).
According to Bill Williams there are 3 sizes of radiator cores fitted to the A7: 14.5" 1923 - 1926 (mag engine), 16" 1928 - 1931 (early coil) and 17.75" 1931-1934 (box)
So the early Chummy type is the smallest.
(Note these are core sizes only, excluding top and bottom tanks).