P 25 Engine Is It A 217 Or A 230?

[larryconnors]

Plymouth switched over from 217's to 230 engines in the middle of the 1954 model year Feb 24th. How can you tell from looking at an engine if it's a 217 or a 230? I'm thinking of putting one in my P15.

[Scruffy49]

Block casting date? I know the spare engine for my truck has a 1955 casting date (230), the current engine has a 1948 casting date (218). Both came out of Plymouths...

[Plymouthy Adams]

_{depends on the production date of the engine...the transition year 1954 used both 218 and 230..the very identifier for the P25 stamped engine is the presence of a diamond emblem in the block serial number which denotes the 230..}

[steve3050]

The Plymouth Owners Club judging information for 1954 says that the last 218 engine was P25* 243000 and the first 230 engine was P25* 243001. This changeover happened at the same time that Hy-Drive transmission option was phased out and the Powerflite came in.

[larryconnors]

The engine number is Diamond P25 Star 346043 Star making it a 230. I could't read the block casting date but it says 5.7.54 on the head. If I may say so, you guys are amazing.

[greg g]

The 230 is a worth while change.  I can attest to withthe change to my 56 model 230.

[Mark Haymond]

A-MAZING. I just hurried to the garage to look at the engine I have taken out of my P-15. It is number diamond-P25-star-300170-star so it must be a 230 rather than a 218. I have had that engine 20 years and did not know it was a 230. Thanks guys.

[Dodgeb4ya]

There is no diamond before the P25...Guess it's a 217. I went out and measured the stroke at 4-3/8".

Bob

Edited August 3, 2013 by Dodgeb4ya