Secrets Of Speed Society
Rocket 428 Speed Head
UPDATED LAST 10/22/2020 . . .page has been frequently updated . . hit your refresh arrow button to see the latest.
Translation: four to eight spark-plugs . . . get it?

"ON A DARK AND STORMY NIGHT . . . IT WAS RUMORED that this is the very same speed head that "Flash" used to power his rocket thrusters for his exciting trip to Mars in 1936 or was it 1938?  On return to earth the enthusiastic crowd overran the space-port and the Rocket 428 was purloined from the engine room and forgotten until now.  While going through stacks of old musty " Space Agency" secret blue prints, The "Yappster" found what he was looking for. . .  After millions of miles, it was operating like new."
The Original Rocket 428 Hi-compression 6.5:1 CR cylinder head for 
Ford Model A and B engines with dual spark-plug capability.
AVAILABLE in two versions:
1: Original Rocket 428 Deluxe at  . . . . $725 plus ship
8 spark-plug ready with 12 head nut washers and 4 Plug Seals.
2: Original Rocket 428 Super Deluxe at  . . . . $955 plus ship MORE INFO HERE
8 spark-plug ready with 12 head nut washers and 4 Plug Seals.
Comes with Thruster Tube and 4 Machined Ports, 8 bolts/washers and 4 O-ring seals.
(requires a pusher water pump).
OPTIONAL Water pump and outlet finned block off plate are extra.
A deposit of $400 down required and balance at shipping.
Spark-Plugs:  14mm, 3/4" reach, flat seat with ring gaskets not supplied.

Sign up today with your deposit and you will get a Rocket 428 Speed head.
Contact Scalded Dog Speed Parts at 513-724-0700 or email your interest to [email protected]
The Rocket 428 comes in 2 versions. . . . . Click HERE to see more of the Super Deluxe Thruster version
Spark plugs on driver's side are the default position. Top side plugs come with our custom Plug Seal.
Of course you don't have to, but when you're ready to to go to 8 sparkplugs your Rocket 428 will be ready. Smoke'n
Each head has a special 1/2 NPT boss on top ready to accept your hot water gauge sender or heater.
Above: The special made ring gaskets are for the stainless steel spark hole seals. 4 of each ship with the head.
Plug seals are available separately for other cylinder heads with dual plugs with 14mm 3/4" threads.  $20.00 each
Below are a few of the first run of Rocket 428 . . "Flash" would be so proud.
PAYMENT: NO CARDS or PayPal, Please and Thank You! 
Send DEPOSIT Checks Only Made out and mailed to:  . . 

3860 CAIN RUN RD, 
Include your EMAIL to receive an INVOICE receipt or ask for a hard copy mailed.
Overseas buyers please contact me for arrangements.
The Water Thruster Pipe is designed to fit the the Rocket 428 Speed Head.
It can be fit to other engines and cylinder heads . . . Think V8-60 and 4 cylinder aircraft and more.
Truster Pipe sold separately unmachined . . .$180.00 each plus ship

Fits all Ford Model A, B, G28T, Gaz, British & Canadian engines 1928-1934
356-T6 fine grained aluminum casting. Polishable.
6.5:1 compression ratio (CR).
Eight (8) spark plug capable for DUAL spark ignitions.
Ships with four (4) spark "plug seals" to run with SINGLE spark ignitions.
Light weight of 24-26 pounds.
Use stock stud sizes and Model A water pump or V-8 pump adapter.
Water port, top rear, for temperature gauge or heater.
Uses any carbon-fiber-over-steel Model B Ford head gasket (we sell).

Accepts large intake and exhaust valves up to 1.750".
Round 3.98" dia. X 0.060" deep fly-cut protects your pistons.
Runs naturally cooler.
Chambers same as the retired Lion Speed Head IV . . proven superior performance.
Expect 65 to 75 HP out of the box . . depends on parts employed.
110 HP or more is easy to attain if you know the "secrets of speed".
Chambers surrounded with extra metal to hold heat for more HP.
Spark plugs on side at 45 degree (prime default position) produce more HP, than over the valves, with a best of class flame front.
Dual Spark ignition produces even more HP and cleaner burn. . . if you decide to go this route.
Scalded Dog Speed Parts, 3860 Cain  Run Rd, Batavia OH 45103, USA . Phone (513) 724-0700, EST
[email protected]