1936 aluminum heads dome/no dome

[Yoyodyne]

Don, Thank you! The body of knowledge here is amazing.

[Don Rogers]

Frank, The 68 head had a slightly larger combustion area in the head than the 48. Thus the warning not to mix the 48 and 68 heads together.

[DavidG]

Two more aluminum head identifying characteristics are: '33 aluminum heads generally have no cast-in part numbers and Ford script was not added to the castings until August, 1934, close to the end of '34 model production.

[frnkeore]

Don,
Thank you, again.

David/Don, these are the markings on what I'm assuming to be my A or A-1 head. It has a 99 and a encircled C. The C looks similar to Don's A-2 head but, in a different place, it's near the front of the head.

Would the circled C mean Canadian?

[DavidG]

Possibly, but not necessarily, especially given that the C in encircled. In addition to a number following the suffix, which normally identifies the supplier who cast the heads, those various suppliers often added their own markings to assist them in identifying when the head was cast should a warranty problem arise.

What is really unusual is the L following the part number in your first photo. Not since the very early days of the 1932 model year had R or L appeared cast into a cylinder head, presumably to avoid confusion as to which side it fit on. Perhaps Ford was concerned that with the introduction of a V8 with two different cylinder heads (right and left) it had to break the normal sequence of its part numbering system where the right-side part normally has a lower basic part number than the left-side part of the same type. It did not take long to figure out that only an imbecile would be unable to figure which side of the cylinder block any given head fit on.