Which makes it from a Canadian-built 1953 Dodge Regent (D43-2). Canadian-built flathead sixes were 25" block units starting in 1938 and had a a letter "C" in the number.
The early 1953 Dodges used a 218.1-cid engine (3.375" bore and 4.062" stroke) but in April they switched to a 4.25" bore for 228.1" cid. The switch occurred at D43-1-3390C and D43-2-8270C. Dodge also introduced an upscale (more chrome, wheel covers, back up lights and two-tone interiors) D-43-3 Mayfair in sedan and hardtop models that used the D-43-2 engines. Hy-Drive was introduced (optional) which was probably the reason for upping the engine size. Dodge dropped the D43-2 Mayfair hardtop at this time as well.
Plymouth did the same, introducing a P24-3 Belvedere in sedan and hardtop with the same engine and appointments as the Dodge. The engine change came at numbers P24-1 4053C and P24-2 8322C.
The stars in US engine numbers were used to block off the engine number, preventing anyone from adding more numbers. As many states used the engine number as the car's serial number, adding digits would be altering the car's serial number.
For engine number P25*272958*, it is the 271,958th P25 engine built. Engine numbers started at 1001. PLymouth in the U.S. did not denote the series the engine was installed nor the assembly plant that put the car together. D43-2 16420 C is the 15,420th D43-2 engine built.
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