9/21/2026
GOOD NEWS
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GOOD NEWS
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CYLINDER HEADS
GOOD NEWS
SEPTEMBER 21/2026
ALL HEADS ARE CAST (REALLY NICE).
FIRST TEST HEAD AND NEW CNC SCANS ARE DONE.
IN TWO DAYS, I TRAVEL TO THE MACHINE SHOP TO DOUBLE CHECK THE WORKMANSHIP AND TOOLS USED. A FIRM DATE IS NOT SET QUITE YET . . .
IT IS TIME TO SEND OUT INVOICES TO ALL THAT HAVE NOT PAID IN FULL.
THIS WILL HAPPEN THE WEEK OF OCTOBER 1ST.
NOTE:
1: WE WILL NOT BE SELLING HEAD GASKETS.
I RECOMMEND THE "BEST" #573-G.
2: THE FOUR (4) SPARK PLUG SEALS ARE
SHIPPING WITH ALL HEADS FREE OF CHARGE - TO SAY THANKS FOR WAITING.
3: WE DO HAVE TO CHARGE FOR SHIPPING THE HEADS.
-CHARLIE-
SEPTEMBER 21/2026
ALL HEADS ARE CAST (REALLY NICE).
FIRST TEST HEAD AND NEW CNC SCANS ARE DONE.
IN TWO DAYS, I TRAVEL TO THE MACHINE SHOP TO DOUBLE CHECK THE WORKMANSHIP AND TOOLS USED. A FIRM DATE IS NOT SET QUITE YET . . .
IT IS TIME TO SEND OUT INVOICES TO ALL THAT HAVE NOT PAID IN FULL.
THIS WILL HAPPEN THE WEEK OF OCTOBER 1ST.
NOTE:
1: WE WILL NOT BE SELLING HEAD GASKETS.
I RECOMMEND THE "BEST" #573-G.
2: THE FOUR (4) SPARK PLUG SEALS ARE
SHIPPING WITH ALL HEADS FREE OF CHARGE - TO SAY THANKS FOR WAITING.
3: WE DO HAVE TO CHARGE FOR SHIPPING THE HEADS.
-CHARLIE-
The Rocket-428 High Compression Cylinder head
Cast Aluminum 356-T6,
7:1 Compression Ratio (140-cc)
All Heads Are Dual Plug.
Cast Aluminum 356-T6,
7:1 Compression Ratio (140-cc)
All Heads Are Dual Plug.
This head wins hill climbs!
Casting and machining time is usually about 4-5 months.
SOLD OUT - SOLD OUT
$xxxxxx
IF PAID BY CHECK
All costs and time suggestions are approximate
and could change as we move forward.
ESTIMATED DELIVERY IS JUNE-ISH (+-)
YAPP STUDIOS INC.
3860 Cain Run Rd
Batavia OH 45103
513-724-9000
[email protected]
SOLD OUT - SOLD OUT
$xxxxxx
IF PAID BY CHECK
All costs and time suggestions are approximate
and could change as we move forward.
ESTIMATED DELIVERY IS JUNE-ISH (+-)
YAPP STUDIOS INC.
3860 Cain Run Rd
Batavia OH 45103
513-724-9000
[email protected]
ROCKET-428 CYLINDER HEAD
356-T6 Aluminum, 7:1 CR
all castings are 8 Spark plugs
FOR THOSE NEEDING A FOUR (4) PLUG HEAD
WE HAVE OPTIONAL
"PLUG-SEALS"
The Rocket's combustion chambers are a match of our very successful
Lion Speed Head III & IV.
The extra thick walls hold heat steady for even firing and extra metal is available to those that want to reshape to their own designs. The spark plug positions are designed for maximum flame front and have proven power on the dyno.
Plugs on the driver's side have more power.
All of Charlie Yapp's cylinder heads are custom tested designs.
Lion Speed Head III & IV.
The extra thick walls hold heat steady for even firing and extra metal is available to those that want to reshape to their own designs. The spark plug positions are designed for maximum flame front and have proven power on the dyno.
Plugs on the driver's side have more power.
All of Charlie Yapp's cylinder heads are custom tested designs.
The foundry and machine shop helping me produce this 2026 production run are the same who have done our Rocket-428 in the last run. They know my need for precision and have proven to me that they will do a fantastic Made-In-USA-job.
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Choose "PayPal" or "checkout use your own card"
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of Rocket Cylinder Heads
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