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Cylinder Heads & Dual Ignition Machine Work



Heads pictured above have been machined for dual ignition.
Cylinder Heads!

Our heads feature 40mm intake and 35.5 exhaust valves. They use a 14mm x 3/4 inch reach plug.
Or the standard 35.5 intake and 32mm exhaust valves. They use a 14mm x 1/2 inch reach plug (stock size).

Each head weighs 1.25 pounds more than a standard head.

All heads have a 3 angle valve job completed to them.

Heads are 100% complete.
Dual Port Cylinder Head 040 or 043 #0154 . . . $299.95 each
Machine a pair of heads for 92 or 94mm cylinders #0155 . . . $80.00
Please specify size of cylinders in the Note Section!
Machine heads for aircraft spark plugs(pair) #0156 . . . $82.00
Please specify size of cylinders.


Dual Ignition - Machine Work

If you plan on running dual ignition, we can install the second set of spark plugs in cylinder heads you purchase from us. We install the second set of plugs on the bottom of the head, in between the pushrod tubes. In our 31+ years of modifying heads in this manner, not one has broke between the new hole, valve seat or valve guide. Spark plugs are accessible with standard socket wrench. If you have an older HAPI, TEC, Mosler or RevMaster dual port engine, our heads will work on your engine. Standard size is 10mm.

We can machine dual ignition in your cylinder heads also. See cost below.


Prices Include Machine Work Only
*Does Not Include the Cost of the Heads Purchased from GPASC!
Machine GPASC dual port heads for dual ignition 10mm
Price . . . $244.95 a pair

Machine GPASC dual port heads for dual ignition 14mm
Price . . . $249.95 a pair

Machine CUSTOMER'S dual port heads for dual ignition 10 or 14mm
Price . . . $294.95 a pair



To place an order: Call us at 1-402-493-6507
Inquiries can also be directed to: info@greatplainsas.com


Great Plains Aviation Supply LLC