The Model A has much larger cylinder than the 216
And there's only 4 of them. A 6 cyl might not need as much cranking because there are 3 compression strokes per revolution instead of 2. If things are in good shape, and (on the Model A) the timing is set right, it only takes getting one cylinder past TDC compression to get it going. Other than my one episode (where I probably had the spark advanced), I was able to start that Model A with the crank fairly easily.
