The 1952 Fastwin was model 4441 and developed 14 horse power. It uses a Tilotson carburetor. The 15 horse Super Fastwin model 15012 came out in 1953 and uses an OMC carburetor. The hole is for a DRAIN, It has already gone through the bearing. I believe it should be routed to the slot in the intake manifold to be recycled. If the hole is blocked, the surplus floods the magneto. . . 😉
