TESTING
Updated 1/14/2021

Rocket  428 
High  Compression  Cylinder Head  
Deluxe

NOW accepting deposited ($400) orders for the late spring run.
NEWS 1/14/2021
The Rockets are flying out the door.
Most overseas orders have been filled and the
USA orders are going out as payment comes in.
Lots of happy guys out there.


NEWS 1-4-2021
The Rockets 428 cylinder heads,
Deluxe and Super Deluxe models arrived over the holidays.
First inspection results are outstanding.

All head are 6.5:1CR and can produce 82HP easily and 110+ HP with all the "secrets".
Heads will be packed with a small bag of loose parts and
the INSTRUCTION sheet with spark plug info.
You will find the sheet between the outer box and the inner cardboard liner.

These head are essentially sold out.
I'm planning a second run.

FINAL PAYMENT
The balance due invoices were mailed today.
You can pay by calling the
office 513-724-0700 or


We prefer a check 
but will happily accept MC, Visa, Discover, M.O. 
OR send money via PayPal to my email:   [email protected]
Those who paid in full will ship first, followed in order of funds received.

Head Gaskets are $48.95 + 17.50 ship.
Save shipping cost up to $35 if you order 2 or 3 gaskets at a time.

Thank you for waiting and thank you for your business.
NEWS 12-29-2020
The Rocket 428 heads (Deluxe and Super Deluxe) have arrive at my shop.

These are some of the best looking we have ever offered.
You will love these heads.
This week we will be closed for the holidays.
We will be back January 4th.
At that time we'll begin contacting everyone.
Shipping will be to those who have prepaid in full and there after
to those that get their invoice paid.
We will accept Visa, MC and Disc. cards, Cashier's Check, MO, PayPal and your personal check (allow 5days for checks to clear).
If you want a new Head gasket ($49.50 + 16.50 ship in the USA) please let me know.
Gaskets can not ship in cylinder head box as they get crushed.
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  . . . . $735 plus ship
8 spark-plug ready with 12 head nut washers and 4 Plug Seals.

2: Original Rocket 428 Super Deluxe at  . . . . $1025 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 block off Plate
Water Outlet finned block off plate

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 Deluxe 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 go to 8 spark plugs 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: 

Send DEPOSIT Checks Only Made out and mailed to: 

YAPP STUDIOS INC
3860 CAIN RUN RD
BATAVIA OH 45103
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 head. 
Think V8-60 and 4 cylinder aircraft and more.
Thruster Pipe sold separately unmachined . . .$180.00 each plus ship

FEATURES
Fits all Ford Model A, B, G28T, Gaz, British & Canadian
engines 1928-1934
356-T6 fine grained aluminum casting. Publishable.
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).


COMBUSTION CHAMBER:
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