Cylinder Head ID

[billrigsby]

 

I have been dropping off bits at the machine shop as they get in.

Friday I am bring the NOS Crank and NOS Head down to be hot tanked.

 

Looked over the three 23" heads I have and all have different casting numbers, 

wondering how to ID and determine differences, if any from those numbers?

 

 

 

NOS Head

 

 

D34 230ci Dodge Car Dodge 6 Custom 1950

 

 

T306 218ci Dodge Truck B-3-B, B-4-B  1951-1953 or Original B-1-D Truck Engine (that I have determined was not stock)

 

 

Edited October 28, 2020 by billrigsby

[billrigsby]

I found some information on applications based on the casting numbers, 

still not too sure. Is there a difference between a 218 and a 230 head?

 

May need to do some volume measurements.

 

Looks like the NOS head is a 218, hope that does not matter.

And the third head is from the original engine.

 

 

Edited October 28, 2020 by billrigsby

[greg g]

Here is some brain f@rt thinking regarding heads.  For purposes of this illustration I looked at the cr for 1950 Plymouth Dodge.  They both have 7.0 to 1.  The dodge having the  longer stroke would seem likely to have more squeeze of the air fuel mix all things being equal.  We know the bore is the same with both so the other variable must be combustion chamber volume.  The Plymouth 218 head must have a smaller chamber to get the same squeeze ratio from a shorter plston movement.  The question has come up before and it is generally surmised if you put a 218 head on a 230 you will raise the compression ratio.  Will your fanny Dyno detect the difference?  Guess it depends on how sensitive it is.

Edited October 29, 2020 by greg g

[Pete]

I have a '39 Plymouth sedan. Someone in the 1950's bored it out to be 218 from 201 and changed the cylinder head. The current head is the same as your second picture above: 1311804-3 with a big "D". I did some checking online but did not find any definitive info on what this was installed on originally. The engine was rebuilt last winter and the block decked and the head shaved. I'm guessing the CR is about 8:1. The fuel flow is good. My seat of the pants dyno says the car has a lot more power, but with an engine rebuild it's hard to pin that improvement on one particular part.

 

Here is some info I collected when I researched that cylinder head. It's likely about 95%+ accurate as I pulled the info from multiple online sources. Any updates are welcome.

 

Pete

 

Plymouth - Dodge CID HP CR 1934 - 59.pdf

[JBNeal]

additional information - measuring chamber volume 

[47 dodge 1.5 ton]

13 hours ago, Pete said:

I have a '39 Plymouth sedan. Someone in the 1950's bored it out to be 218 from 201 and changed the cylinder head. The current head is the same as your second picture above: 1311804-3 with a big "D". I did some checking online but did not find any definitive info on what this was installed on originally. The engine was rebuilt last winter and the block decked and the head shaved. I'm guessing the CR is about 8:1. The fuel flow is good. My seat of the pants dyno says the car has a lot more power, but with an engine rebuild it's hard to pin that improvement on one particular part.

 

Here is some info I collected when I researched that cylinder head. It's likely about 95%+ accurate as I pulled the info from multiple online sources. Any updates are welcome.

 

Pete

 

Plymouth - Dodge CID HP CR 1934 - 59.pdf 37.96 kB · 7 downloads

Nice Data, I wonder if there is something put together for the 25” heads?

[billrigsby]

I found some more information from a post 'Shaving a 218 head vs. a standard 230 head?' December 3, 2017

Seems the NOS head has a smaller chamber volume, being for a 218, how will that work in a 230?

 

Sounds like 230 pistons are right at or very close to the deck at TDC and 218's are 'a couple of 32nds' below.

Wonder what the CR would be with the NOS head? It will need some milling 'cleanup' due to rust, but minimal.

 

Edited October 30, 2020 by billrigsby

[billrigsby]

 

Dropped off the last bit of parts today at Rocky Mountain Machine, ran into Bill Schwindt a member of the Dodge Pilot-house Era Truck Club of America.

Had a nice talk and saw some photos of his trucks.

 

Was please to see good progress, may be ready for pickup next Friday, not sure where the two months out I was told.

Definitely not going to complain about an early Christmas present  ?.....