What is this Head

[Model A Ron]

I have a head on a 28 engine that has 06-4 cast into it. Does anyone know if this is a high compression head and if so what is the compression?

Thanks

 

[ModelA29]

That looks like a date code June 1934???? Model B head??? 3 bolt (Model B) or 4 bolt (Model A) water pump?

 

[Model A Ron]

That looks like a date code June 1934???? Model B head??? 3 bolt (Model B) or 4 bolt (Model A) water pump?

The guy I got my 28 pickup project from said it was a Model A High Compression head but the current Snyder's 5.5 and 6.0 do not have a code cast in the head. Does anyone know for sure if this is a Model B or Police head? If so what was the compression on them?

As for the engine it is a 28 and from the looks of things it does not appear to be re-stamped......do not ask me how I know lol

 

[jeepguy1948]

You need to answer the question, does it have a 4 bolt water pump or a 3 bolt water pump? That will tell you A or B

 

[Model A Ron]

It's a 4 bolt water pump.

 

[jeepguy1948]

In that case it is a Model A head, beyond that I can’t say.

 

[Model A Ron]

In that case it is a Model A head, beyond that I can’t say.

I have a feeling it's an aftermarket head produced in 19?? with a compression of ?.??

 

[Bob Bidonde]

Your cylinder head is an aftermarket service part that was cast by a forging shop in June of 1940. I have had several heads with casting dates on them, and they have all had the stock compression ratios, 4.2:1 for the Model "A" and 4.6:1 for the Model "B". There is no apparent feature on the current 5.5:1 and 6:1 reproduction heads that shows them to be other then stock.
If the water pump attachment has 4 holes, the head is for a Model "A". If the head has 3 water pump attachment holes, it is for a Model "B".

 

[Y-Blockhead]

There is no apparent feature on the current 5.5:1 and 6:1 reproduction heads that shows them to be other then stock.

The Snyder 5.5 has two dots on top and is physically smaller than the stock head. Don't know about the 6.0 as I don't know anyone that has one.

 

[4bangerbob]

The model A head with a large cast B on the top of the head is the police head. This head uses the 4 bolt water pump.

The Model B head has a large C cast on top of the head and uses the 3 bolt water pump.

 

[Dodge]

Do a compression test and give us the numbers, if their all even we can take a WAG
(wild *** guess)