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Bored block to 85mm - what about the head?

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Old Aug 4, 2006 | 07:32 AM
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7rrivera7's Avatar
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From: Comerio, PR, USA
Default Bored block to 85mm - what about the head?

Does anyone do anything to their VTEC cylinder heads when boring their blocks out? Since the head stays at 81mm how does this affect combustion? Is there machining which can be done to the head to match the block or is this unnecessary?
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Old Aug 4, 2006 | 07:37 AM
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xDicktonesx's Avatar
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From: Hessian Aggression
Default Re: Bored block to 85mm - what about the head? (7rrivera7)

yea , you can unshroud the valves a little more and open up the combustion chamber. someone else chime in who knows a little more than i do about it
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Old Aug 4, 2006 | 09:15 AM
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Default Re: Bored block to 85mm - what about the head? (xDEFTONESx)

do not do it.

https://honda-tech.com/zerothread?id=520175

https://honda-tech.com/zerothread?id=889248
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Old Aug 4, 2006 | 09:25 AM
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Supernatural's Avatar
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Default Re: Bored block to 85mm - what about the head? (EVOL)

heres another thing to consider....what happens if you need to put that head back on a 81mm motor?
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