Originally Posted by Old Ray
Originally Posted by wayfarer
Minor clarifications..
The first Plymouth only engine, the 'A' series, was 1956 at 277 cubic inch.
The Dodge based Poly engines, 241 and 270 overlaped the A engine into 1956 in the Plymouth car line.
The Chrysler 'Poly' engine was the Spitfire and was first used in the 1955 Windsor as a 301 ci. This is a poly head on a Hemi block. This is NOT the same as the Plymouth 301 which is an A engine. In 1956 the Spitfie used the 331 block and in '57 and '58 was a 354.
The Dodge based Poly can be converted to Hemi.
The Spitfire can be converted to Hemi.
The Plymouth A series cannot be converted.


Is there a LOGICAL explanation for why the engineers at the time (and latter) had such a proliferation of different unrelated engines ... other than LSD in the water cooler?
For the average klutz (me) it is impossible with out a cheat sheet to keep this all straight`, ... it gives me a headache! spank


They didn't know any better. They thought they were improving things. They didn't understand that they were polluting the production line until some point in the 70's when the Japanese started to kick their rears. Then they figured out that they didn't have to change everything every year.