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Interior Views
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Under the Hood
of the 1931 Model A U. S. Mail Truck

Under the hood you can see the detail of your typical Model A engine compartment. Photos 46, 48, 49, 50, 51 show the full flow oil filer, an accessory to help prolong the life of the engine. Please note in photos 53 and 54 you will see the new old stock Firestone Post Office Department spark plugs.
43. View of firewall. 44. Drivers side of the engine compartment.
45. Passenger side of the engine compartment. 46.
47. 48.
49. 50.
51. Full-Flow oil filer. 52.
53. Close up of Firestone spark plugs. 54. Detail shows P. O. D. (Post Office Department) markings on spark plugs.