Secrets Of Speed Society
High Compression Speed Head
NEWS 3-23-2020:  In this space you will find NEWS about the ROCKET 428 SPEED HEAD and its development stages.
The Lion Speed Head III and IV have been retired.
We will not be making any iron heads

The new Rocket 428 Speed head is being developed from the existing Lion Speed Head casting patterns.

What that means:  The combustion chambers and water jacket will be picked up from existing Lion Speed Head tooling.
The Rocket 428 will have the same horsepower and performance characteristics that made the Lion Head so popular.

Why?  I have wanted, for quite a while, to create something new to make it more fun for you and to challenge my brain.  
The last run of Lion aluminum head's failed utterly at the foundry and caused us tremendous grief and great loss.  
That experience lead to this new Rocket project and a couple other cool new products.
One being our new, never before, cast aluminum show oil pan for both Ford Model A and B engines.

What does the Rocket 428 look like? It's a secrets (grin). You're going to love it.
It is different. There will be fins and curves and eye candy to make you smile and excited . . . So, stand by first for drawings, then computer images, and then photos of the tooling followed by photos of the test castings . . . so come along for the ride . . . . be sure to get on the list . . no obligation, but it will help us plan the casting runs. . . .When we get close I will ask for a $200 deposit to guarantee that you get the new Rocket 428 Speed Head.
Need more info? Call me, Charlie Yapp  513-724-0700 or email me [email protected]
ROCKET 428 SPEED HEAD . . .356-T6 Aluminum . . .$ TBA plus shipping . . .  
 . . . . .  due to the Coronavirus Pandemic this project does not have a firm shipping time frame for 2020.  We are going to try . . .
Machined for 8 spark plugs and 6.5:1 CR   (other CR up to 8:1 are custom  "Special" orders $ TBA)
Using dual spark plugs (8) requires a specialized dual coil - dual fire ignition.
All Rocket 428 heads come with 4 spark plug seals . . .  to seal off unused spark plug holes if needed.
Each Head is ready for large (1.732" dia) intake valves and high lift camshaft.
Aluminum Weight 24 pounds (estimate)
ROCKET 428 Speed Head . . . image goes here when available
3/23/2020
SEND IN YOUR NAME AND ADDRESS NOW . . . .no obligation at this time . . .get on the list.
Tell us what you want and we will put you on the waiting list.
We need full name, billing/shipping address, phone and email address.
We will invoice you for the $200 non-refundable deposit about the time the castings are STARTED.
Remember - checks only for deposit.
Checks, Visa, MC, Disc. & PayPal accepted for balance.
OVERSEAS orders must be paid with PayPal (easy to do). 
A 4% HANDLING FEE on overseas orders. 
We can easily arrange for a Bank Transfer if prefered.  
Charlie Yapp   (513) 724-700 (OH)   [email protected]








FEATURES:
(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) At the machine shop we tap (thread) one rear stud hole to 1/2"-13 treads. This is so you can screw in an eye bolt to assist in lowering and lifting 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 aluminum and is shaken out leaving a hollow space.
The Rocket 428 Speed head uses the same exact water jacket and combustion chamber design of the old Lion Speed head which will continue making  the Rocket 428 the most powerful and desirable head in the field. 
Images from the foundry. These cured cores (water jackets) are placed into the molds and then the second half of the mold is laid in place. These are then rolled down the conveyor line to the pouring station. A few heads are assembled and poured at a time.
Model A & B Ford High Compression Cylinder Head
Fits 1928 to 1934 Ford Four Bangers
  • * DEPOSITS RULES: 
  • Required
  • There is a $200.00 non-refundable deposit required for each ROCKET head ordered. 
  • 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.
  • PLAN ACCORDINGLY.
  • 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: [email protected] or 513-724-0700, Monday to Thursday, EST, 9-5
General Information









 
Each new Rocket 428 Speed Head will feature 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.
DYNO TESTING: The old and now retired 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 setups.
Look around Dennis Piranio's  site it's loaded with good information (DYNO CHARTS below).
The new Rocket 428 Speed Head in aluminum should feature almost exactly the same HP and torque curves.
The new Rocket 428 Speed head  has 8 plug capability & a water temperature port on top in back corner.
WEIGHT:  Aluminum is 24#.
HORSEPOWER out of the box should be about 78HP with mostly stock appointments.
HP in highly modified engines, as high as 190 HP, has been documented. 110HP is common.
70 HP to 110 HP is possible in nicely restored street engines.
COMPRESSION RATIO: Rocket 428 heads will be machined to 6.5:1 CR and could be machined to approx 12:1 CR.
Our 6.5 CR chamber has near the same cylinder pressure as other heads machined to 7:1CR.
SPARK PLUGS: Primaries  are on the driver's side and require ignition wires to connect.
Rocket 428 heads should 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 OUR carbon and aramid fiber gaskets with a steel core and steel fire rings.
Adding a zinc bar or two to your coolant plus antifreeze made for aluminum engines will greatly reduce electrolysis.
"SPECIAL" PROJECTS:  We can produce a Rocket 428 to just about any dimension you need. An example of a "Special" might be: Head casting fully machined except for the combustion chambers. this might be for a customer who wants trick combustion chambers made to his research and testing. This customer may shape the chambers, change the thickness, create new angles to try to squeak out a few more HP. The Rocket 428 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.
Higher CR can be machined at $150.00 extra
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 capable 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 chambers and spark plug position (Now the new Rocket 428).  Thanks, Dennis!

TO BUY A ROCKET 428

SEND IN YOUR NAME AND ADDRESS NOW
Tell us what you want and we will put you on the waiting list.
We need full name, billing/shipping address, phone and email address.
We will invoice you for the $200 non-refundable deposit about the time the castings are STARTED.
Remember - checks only for deposit.
Checks, Visa, MC, Disc. & PayPal accepted for balance.
OVERSEAS orders must be paid with PayPal (easy to do). 
A 4% HANDLING FEE on overseas orders. 
We can easily arrange for a Bank Transfer if prefered.  
Charlie Yapp   (513) 724-700 (OH)   [email protected]
Scalded Dog Speed Parts, 3860 Cain  Run Rd, Batavia OH 45103, USA . Phone (513) 724-0700, EST.  [email protected]