Cone plug heads
PMB Model Boats

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Twin cone heads on CMB 90 EVO2002. Although spaced differently, performance with the same trapped compression ratio is identical.
   
.21 head with Globee flat coil plug with taper seal held in with steel locking collar.  .21 single cone head using Nelson cone plug ( Nelson cone plug is a bigger o.d. than Novarossi or CMB cone plugs.)
   
Twin cone plug head for CMB 21 SS Twin cone plug head for CMB 21 SS

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