freeze plugs ?
 

Why did Henry not have freeze plugs in the Model A block? He had them in the Model T, but then chose not to include them in the Model A.
How come?

Re: freeze plugs ?
 

USUALLY freeze plugs in an engine especially modern engines is its a hole used during the casting process and then yes doubles as a freeze plug hole so your block doesnt (supposedly) crack.

Maybe he had a different casting method for A engines?

Re: freeze plugs ?
 

Henry was quite proud of his "cast en-block" one piece engine blocks. Perhaps he viewed a requirement for additional holes as some sort of compromise to his ability to cast a block?

My experience with frozen Model As is the damage is usually done to the head by pushing up a section adjacent to the distributor. Not to say that it can't or won't cause damage elsewhere.

Joe K

Re: freeze plugs ?
 

That is correct they are core holes that get a welch plug to seal in the Model T and many other motors. Even with them the T likes to crack on the drivers side anyway! :)