1955 y block

[55 Tudor]

I have a 1955 mercury y block that has 14 mm spark plugs. Has anyone heard of this. Most I have talked to are 18 mm. Thanks

 

[Sid]

Are the heads aluminum? Mummert's aluminum heads are 14mm.

 

[craig]

1954 used 14mm spark plugs

 

[dmsfrr]

What casting number is on the engine block? Location photos & reference chart at this link.
http://www.ford-y-block.com/Block%20identification.htm

How about the casting number on the heads?
You can check them at this link...
http://www.ford-y-block.com/cylinderheadchart.htm

Heads for the 239 and 256 engines in '54 used the smaller spark plugs.
Chances are the heads you have are; EBU, EBV, EBY or EBZ, the earlier/1st year y-block versions.
.

 

[scicala]

I know it's probably just a typo, but the '54 Mercury 256 and '54 Ford Police 256 Police option had EBY casting numbers.

Sal

 

[dmsfrr]

I know it's probably just a typo, but the '54 Mercury 256 and '54 Ford Police 256 Police option had EBY casting numbers.
Sal

Did I do that? Fixed.