I was just wondering if there were two '61 styles. I saw a picture of what they said was a '61, but it had a hood like a '60. Then there was a picture of a '61 that had a hood like a '62. Was there a style change mid-year like '47 and '55? Thanks.
You are a little mixed up there...........a 1961 should have a hood like a 60..same hood. Cat Eye hood was two year only. 62-66 have "new" style. The hoods are interchangeable from 60-66. There were several changes made to various parts. The Cat Eye became unavailable to collision repair shops. So they, and owners, put on a 62-66 hood. Those 60-61 hoods are rare today.
When you ask about 47.1/47.2 and 55.1/55.2 you are talking a complete redesign. Changing hood. headlights, grill, emblems or seat material are not that type.
The 60-66 went thru some fairly large changes: in 1963 torsion bar front was changed to coil springs. Various suspension changes followed. In 1964, wrap-around windshield was changed to flat. To name a few. The Chevy trucks are broken down into I.E. 47.2-55.1, 55.2-59, 60-66, 67-72...... according to basic style and platform. All had various "improvements" within the style and platform. The splits were determined by complete redesign.