Secrets Of Speed Society
Lion Speed Head
UPDATED     1/7/2019



Send an email to  with ONLY your Name, Address and all contact info and how many you want.
We will print out the email and add it to the Lion IV (aluminum)  Waiting File.  . . . No Iron heads this year.
When we receive the raw castings we will send you an invoice with $100 non-refundable deposit due on receipt.
Orders will be filled in order of deposits received. You will be notified when to pay the balance.
Tax is charged to residence of Ohio.

SOSS Members get Free shipping on orders of $100 or more (Aluminum heads only)


Scroll to Bottom Of Page to see Prices & Specs

(1) One of our most import features is that each head is heat treated to relax the grain of the casting. This stops warping of the casting all through the various steps to machine the head.
(2) Another is that we have nickle added to the iron mixture. This makes it stronger for a lifetime of strength.
(3) Each iron casting (not aluminum) is sprayed with an electro-coated semi gloss black paint. This is to prevent premature rust in handling and storage. The machined surfaces are not painted and you can apply any type of coating over the black.
(4) At the machine shop we tap (thread) on rear stud hole to 1/2"-13 treads. This is so you can screw in an eye bolt to assist in lowering and lift the head to and from the engine. The stud must be removed to utilize this clever feature.

This image shows nine "cores" waiting to be added to the molds. Cores are the part of the process that make the hollow water jacket in the cylinder heads. This material turns to dust after pouring the iron mix and is shaken out leaving a hollow space.

Look closely and you'll see 4 small rectangle depressions in a row. These end up being strong support bosses above the combustion chambers, that greatly improve strength and rigidity of the head, both from warpage and from combustion pressures. . . just another feature of the iron Lion Speed Head III that makes it the most powerful and desirable head in the field.  All our heads have this feature.
Images from our foundry. These are the painted cores (water jackets) placed into the mold and then the second half of the mold is laid in place. These are then rolled down the conveyor line to the pouring station to pouring. They build and pour about 8 or so at a time.
Model A & B Ford High Compression Cylinder Head
Fits 1928 to 1934 Ford Four Bangers

Send me an email (
or call 513-724-0700 - M-THUR, EST, 9 am -5 pm
Closed Friday-Sunday
Leave short message if no answer 

  • Required
  • There is a $100.00 non-refundable deposit required for each head ordered. No other waiting list is offered.
  • This guarantees that you get as many heads as you want. . . . . this included Dealers.
  • We seldom, if ever, have extra heads to sell off the shelf.
  • We make these heads once a year.
  • If you chicken-out you lose the deposit.
  • There is no specific time, only a general time-frame for delivery.
  • The deposit is not a credit toward other product or future production.
  • The deposit is refundable only if we fail to produce.
  • Deposit can be with your personal, MO or bank check (CARDS CAN NOT BE TAKEN FOR LONG TERM DEPOSITS). 
  • We are a small business and often get bumped at foundries and machine shops when the big boys get in the way.
  • Questions about this policy?  Please email or call us: or 513-724-0700, Monday to Thursday, EST, 9-5

SOSS Members get 10% off these parts

Lion Speed Head IV - 4  

356-T6 Aluminum - 4 Plugs . . .$650.00
Offered in 6.5: compression ratio.
110+ HP tricked out . . . If you know the Secrets Of Speed.
Weight 24 pounds  -  unpainted - fine grained - unpolished.

Lion Speed Head IV - 8  

356-T6 Aluminum -  Eight Plugs . . . $700.00
FREE shipping for Secrets Of Speed Members 

Same great head but machined for dual spark plugs. 
If utilized this requires a special dual ignition system that fires two spark plugs at the same time.
Offered in 6.5: compression ratio only.
110+ HP tricked out . . . If you know the Secrets Of Speed.
Weight 24 pounds  -  unpainted - fine grained - unpolished.

Lion Speed Head III  . . . OUT OF STOCK - Iron will not be made this year (2019)
Special nickle added cast iron, heat treated, painted black and CNC machined to perfection.
Offered only in 135 cc chambers and with 4 spark plug holes (approx 7.25:1 CR)
(8 plug NOT available in iron).
Same great head but in long lasting cast iron.
110+ HP tricked out . . . If you know the Secrets Of Speed.
Weight 52 pounds .
General Information

  Each new Lion Speed Head features a threaded stud hole (at #8) to screw in a 1/2"-13 lifting eye.
Lift with a strap from the eye bolt  to the water pump hole.
LION Speed Head chambers are CNC machined and special in several ways: Each are equal in cc'c,  each will accept up to 1.75" dia. valve heads and can be machined to accept 2" valves.

Circular  fly-cut above the pistion is 0.060" (+-) deep.
Our head gaskets "crush" to about 0.042"/ 0.044" @ 55 foot lbs.
Most engine rebuilds have 0.20" to 0.40" piston pop-up.
The Lion will accommodate almost any rebuild with safety space to spare.

FYI: "Squish" is that space between the piston top and the round chamber ceiling. More power is created when "squish" is at it's closest. We give the customer a little extra space for safety. Customized decking of the head to improve "squish" can be done at your end to maximize HP and torque. The rule of thumb is 0.020" squish at TDC is good/safe.
DYNO TESTING: The lion Speed Head has broken at least one Land Speed Record and more attempts are in the works. 
Click this button to see the extensive Dynamometer testing on a wide variety of set ups.
Look around Dennis Piranio's  site it's loaded with good information (DYNO CHARTS below).
LION III iron & IV aluminum cylinder heads feature almost exactly the same HP and torque curves.
Only the aluminum IV has 8 plug capability & a water temperature port on top in back corner.
WIEGHT: Iron version is 52#. The aluminum is 24#.
HORSE POWER out of the box is about 78 with mostly stock appointments.
HP in highly modified engines, as high as 190 HP, has been documented.
70 HP to 110 HP is possible in street engines.
COMPRESSION RATIO: Lion Heads are machined to 6.5:1 CR and can be machined to approx 12:1 CR.
Our 6.5CR has near the same cylinder pressure as other heads machined to 7:1CR. Higher CR is NOT offered.

SPARK PLUGS: Primaries  are on the driver's side and require ignition wires to connect. 
Lion Heads run better with a "cool" plug like AC Delco R44XLS (14mm, 3/4" reach, flat seat with ring gasket, non projected nose, cool heat).

WATER PUMP mount is for either a Model A water pump or a Model A to early Ford V-8 conversion adapter.
HEAD GASKETS are extra and stocked. NEVER use a copper head gasket with an aluminum cylinder head. Use carbon and aramid fiber gaskets with a steel core and steel fire rings. Adding a zinc bar or two to your coolant plus antifreeze for aluminum engines will greatly reduce electrolysis.
SPECIAL PROJECTS:  We can produce a Lion Speed Head IV to just about any dimension you need. An example of a "Special" might be: Head casting machined except for the combustion chambers. . customer who wants a trick cylinder head made to his research and testing. This customer may shape the chambers, change the thickness, create new angles and spark plug positions to try to squeak out a few more HP. The Lion Speed Head is the only Model A and B Ford cylinder head capable of such manipulation because it was designed that way (there are limits) . . .We have cast in more wall thickness in and around the combustion chambers and deck to play with.
If you order a Special head, as roughly described, from a normal full production run, the cost will be our normal retail price. If outside a normal run there will be extra charges.

IMPORTANT NOTE about Compression Ratio (CR):

We normally provide Lion heads at 6.5:1 CR.
Higher CR can be machined at $150.00 extra per 1/8".
The owner can easily have their head milled to as high a CR as they want locally.
WHAT'S with the spark plug positions? As with all of the cylinder heads I make the spark plug position, on the driver's side, was part of something my gut told me would prove to be an effective place to be  . . . The conventional wisdom was that it would not . . . .The original Riley-Valve-In-Head (Two Port OHV) had the valves on the driver's side. It was this first version of George Riley's product line that won more races on salt and dirt tracks in the 1930's. When he switched plug positions (to make foundry casting easier)  the numbers dropped off when the spark plugs were moved to the passenger side. Other OHV conversions started winning (source; 4 cyl. racing engines used/wins from 1930-1935 race results) .

I also subscribe to the thought train that if one is to make Hop-Up speed parts . . .They should look like it and not dumbed down to look stock. Have fun and go for it . . you will have more fun than the other guys!

Professional Engine builder Dennis Piranio, Denton, Texas thought so too . . . He was capabale and interested enough to find out. With his performance dedicated Model A Dyno he prove it. Click the button to see the report that shows 2-3 more HP at our default position. Read Dennis' interesting comments on the Lion Speed Head.  Thanks, Dennis!


Tell us what you want and we will send you information and/or an invoice.
For invoices we need full name, billing/shipping address, phone and email address. Remember - checks only for deposit. Checks, Visa, MC, Disc. & PayPal accepted for balance. OVERSEAS orders must be paid with PayPal (easy to do).  We can easily arrange for a Bank Transfer if prefered.  Charlie Yapp   (513) 724-700 (OH)
Scalded Dog Speed Parts, 3860 Cain  Run Rd, Batavia OH 45103, USA . Phone (513) 724-0700, EST.