Updated  1-26-2023
SOLD OUT
THESE HEADS ARE NOT IN PRODUCTION AT THIS TIME
LAST PRICE WAS $850 PLUS SHIPPING

Yapp Studios Inc
3860 Cain Run Rd
Batavia OH 45103
You will receive a statement back showing amount pre-paid.
Balance will be due at shipping time.

All heads are 6.5:1CR. 8.5:1CR possible.
110+ HP using the "secrets".
Heads will be packed with a small bag of loose parts and
the INSTRUCTION sheet with spark plugs info.
You will find the sheet between the outer box and the inner cardboard liner.

The Original Rocket 428 
Hi-compression 6.5:1 CR cylinder head for 
Ford Model A and B engines. 
Has dual spark-plug capability.
AVAILABLE in two versions:

 Original Rocket 428 is $850 plus ship
Eight spark-plug ready with
12 head nut washers and 4 Plug Seals.

Spark-Plugs
14mm, 3/4" reach, flat seat with ring gaskets - not supplied.

Contact Scalded Dog Speed Parts at 513-724-9000 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 S.S. Plug Seals.
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 water port
 1/2" NPT boss on top, ready to accept
your hot water gauge 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 Rocket 428
cooling down after heat treating.

FEATURES
Fits all Ford Model A, B, Burtz, 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.
Lightweight 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.
Use carbon-fiber-over-steel Model B Ford head gasket (we sell).


COMBUSTION CHAMBER:
Accepts large intake & 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 Lion Speed Head IV . .
proven superior performance.
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.
Optional Dual Spark ignition produces
even more HP and cleaner burn.

Scalded Dog Speed Parts, 3860 Cain  Run Rd, Batavia OH 45103, USA .
Phone (513) 724-9000, EST
 [email protected]