1966 lesabre custom 400

[cheyanne1013]

I am trying to decode the body number and for some reason it doesnt come up in my book they have a different code for the lasabre the # i have is 66-45469 and the 4 codes for the custom are 5437,5439,5467,and 5469.Another thing is the breather says 375 wildcat how come this isnt in the book either? and all the 340 engines are 220 and 260 not 375 none of the engines produced this year do not have 375 horses or 375 ci.I just dont know

[bluewhale13]

Your 375 is the torque rating for you motor. According tothe 66 service manual, 45469 is a 66 4door, sedan thin pillar. the other codes you reference are the fisher build codes that break down specific additional info on the car.
Your 375 air cleaner should have underneath it a 4 barrel, 340 cu in motor. This is a factory 10:25 to 1 comp. ratio on this engine. You will find the casting on the dirver's side of the block between the exaust manifold ports. Or look on the driver's side of the motor on the bottom below the exaust near the back f the blokc and you should find a 340 cast into it.
The 375 indicates that your car has the L77 engine option.