Author Topic: XO HEAD MODS  (Read 5288 times)

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Offline HOTRODRON

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XO HEAD MODS
« on: January 25, 2016, 12:07:26 AM »
WHAT IS THE LIMIT THAT CAN BE DONE TO THE XO CLASS HEAD INTAKE /EXHAUST PORTS

Offline RichFox

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Re: XO HEAD MODS
« Reply #1 on: January 25, 2016, 09:35:30 AM »
You can grind them all you want. You can't add ports.

Offline Buickguy3

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Re: XO HEAD MODS
« Reply #2 on: January 25, 2016, 12:29:02 PM »
  Can you relocate the ports?
     Doug  :cheers: :cheers: :cheers:
I keep going faster and faster and I don't know why. All I have to do is live and die.
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Offline RichFox

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Re: XO HEAD MODS
« Reply #3 on: January 25, 2016, 02:37:26 PM »
You should know better that others.

Offline SPARKY

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Re: XO HEAD MODS
« Reply #4 on: January 25, 2016, 03:05:41 PM »
 :cheers:
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Offline Buickguy3

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Re: XO HEAD MODS
« Reply #5 on: January 25, 2016, 09:39:29 PM »
    Apparently you can move them within the "spirit of the rules".  :-D
  Doug  :cheers: :cheers: :cheers:
I keep going faster and faster and I don't know why. All I have to do is live and die.
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Offline Polyhead

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Re: XO HEAD MODS
« Reply #6 on: January 25, 2016, 11:09:31 PM »
oh jese... you guys are bad...
Ben 'Polyhead' Smith
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Offline saltracer1

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Re: XO HEAD MODS
« Reply #7 on: January 26, 2016, 12:56:01 PM »
are these modifications limited if in a vintage body class, but unlimited if in something like a streamliner, lakester?

Offline Buickguy3

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Re: XO HEAD MODS
« Reply #8 on: January 26, 2016, 06:34:40 PM »
  They apply to both.
  Doug  :cheers: :cheers: :cheers:
I keep going faster and faster and I don't know why. All I have to do is live and die.
                   [America]

Offline mtkawboy

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Re: XO HEAD MODS
« Reply #9 on: January 26, 2016, 06:58:39 PM »
What we have here son is a failure to communicate..................Cool Hand Luke

Offline Stan Back

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Re: XO HEAD MODS
« Reply #10 on: January 26, 2016, 07:22:46 PM »
. . . but if you insist on adding ports and such -- and don't want to (or eligible to) run in XXO, the 302 fits right in the D class.  Won't bother a soul.
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Offline jimmy six

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Re: XO HEAD MODS
« Reply #11 on: January 26, 2016, 08:45:25 PM »
Stan, only if you make it illegal in Vintage; electronic fuel injection will do it & so will OHC.

Others have asked why smaller cube GMC can't run in the smaller classes. The reason is XXO and XO are 0-325" and not divided as "normal" engine breaks. But as answered make them illegal for Vintage and your OK.

My typical response to the limit of "modification" is if you can bolt on the stock manifolds and they can seal your pretty much OK. This is why there are 2 different classes. Good Luck.
First GMC 6 powered Fuel roadster over 200, with 2 red hats. Pit crew for Patrick Tone's Super Stock #49 Camaro