Are you asking about the manufacturer of reproduction
original heads for the 21 stud flathead?
Or, are you asking about 21 stud finned aluminum heads? If so, see >
http://www.montereyspeedandsport.com/catalog/?page=2
Monterey Speed & Sport // 10 Harris Court, Suite B-1 // Monterey, CA 93940 // 831.649.0890
They do their own casting. See below....
// Eddie Meyer 21 Stud Cylinder Heads (1932 to 1936)
Designed for use on 1932 to 1936 Ford flathead V8 engines, these
Eddie Meyer cylinder heads are the only heads currently manufactured in the US for the 21 stud Ford flathead V8 engine. Will also work on 1937 and 1938 Ford flathead V8 engines by moving the water pumps to the cylinder heads from the block, and using block-off plates to cover the exposed water pump holes in the 1937 and 1938 blocks. Please inquire for additional details. Compression ratio: 8.25 to 1. Available for either flat top or domed pistons.
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Monterey Speed & Sport only reproduces rare and unusual flathead speed equipment that is unique to the industry.
All aluminum parts are cast in Alcoa 356 aluminum, heat treated to a T-6 hardness, and machined on CNC equipment to ensure consistency in quality and performance.
Our products are cast with a more refined casting sand than is normally used by foundries. This casting technique produces much more refined products, which are noticeably different in overall visual appeal than our competition. Due to their more refined finish, our products are much easier to polish. When polished, they hold their brilliant shine for a much longer period of time, due largely to our use of Alcoa 356 aluminum and our heat treatment process. The quality of workmanship and accuracy of reproduction details set the highest standard for the vintage speed equipment industry.