"Ron Natalie" wrote in message om...

MODEL YEAR CHANGES
172 1956 37 gallons usable fuel, Cont. O-300-A,B 145 HP, 2200 lbs gross
172A 1959 Swept tail, O-300-C,D
snip

Great list Ron! For those keeping score, be advised that the
"Year" column on Ron's list is the actual year that the modification
was made. The Model Year of the change is one higher. For example,
the swept tail was introduced on the '60 172A, the 150 hp Lycoming
appeared on the '68 172I and the 160 hp H2AD engine showed up on the
'77 172N.

John Galban=====N4BQ (PA28-180)