Model A

Ford Garage

Simmons Super Power Head

Pictured here is a cast iron Simmons Super Power Head aftermarket high compression cylinder head for Model A's.

This head was produced in the early 1930s in a 5.5:1 compression ratio according to Simmons catalog information.

Note the "Licensed by Chrysler Motors" cast into the head. The head was not made by Chrysler, but the Ricardo combustion chamber design was used by Simmons under license from Chrysler.

See the link below for some history on Harry Ricardo's engine and combustion design research.

Note the placement of the spark plugs on this head. They are moved further away from the intake valve, which is a performance advantage.

Most Model A high compression heads retain the stock spark plug placement directly over the intake valve, where it is shrouded and not optimally placed.

More related information on Ford Garage:

  1. For more Model A & B related information, use the Site Search box at the top or bottom of this page.
  2. Model A & B Ricardo Combustion Chamber Design Information
  3. Model A & B Simmons Cast Iron Intake Manifold
  4. Model A & B Cast Iron Cylinder Head Variations and Compression Ratios
  5. Model A & B Cylinder Head Gasket Guide comprehensive listing
  6. Model A & B Cylinder Head Nut Tightening Sequence
  7. Model A & B Snap-on Cylinder Head Nut Wrench proper torque application tool
  8. Model A & B Cylinder Head Flatness Requirements by Larry Brumfield
  9. Model A & B Cylinder Head Stud Removal Tools
  10. Model A & B Broken Cylinder Head Stud and Bolt Removal

January 1999