XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Bonner Engineering May B Heads

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Old Feb 14, 2026 | 02:44 PM
  #1  
Bear77's Avatar
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From: Australia
Default Bonner Engineering May B Heads

Morning All,

Does anyone know what happened to Como’s Bonner Engineering V12 head swap? He was planning before/after dyno testing but disappeared before posting results. I’ve tried messaging him with no luck.

Also just noticed Mobeck Tekniske has recently added his own interpretation of the HE heads to his lineup. A very nice looking option too.

Cheers,
Glen
 

Last edited by Bear77; Feb 15, 2026 at 12:47 AM. Reason: Addendum
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Old Feb 15, 2026 | 11:41 AM
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TooManyJaguars's Avatar
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From: San Diego
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The most effective answer is using AJ16 heads on the V12, a bit complex but many people have done it
 
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