V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

2.8 heads on 3.1 ??

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Old Jan 7, 2011 | 09:24 PM
  #1  
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2.8 heads on 3.1 ??

will 2.8 heads bolt to a 3.1 ?
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Old Jan 7, 2011 | 09:32 PM
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Re: 2.8 heads on 3.1 ??

Yes, but they are the same, except for the pre '86 "non H.O." heads, so I'm not sure what you're looking to gain.
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Old Jan 7, 2011 | 09:35 PM
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Re: 2.8 heads on 3.1 ??

im going to pull the 3.1 and put in a 5.7 but i would like to fix the 3.1 for an s10 later
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Old Jan 7, 2011 | 09:55 PM
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Re: 2.8 heads on 3.1 ??

Yea they fit, all 2.8, 3.1, and 3.4 heads are the exact same.
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Old Jan 7, 2011 | 09:56 PM
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Re: 2.8 heads on 3.1 ??

Again, I still don't see why you'd swap the 2.8 heads onto the 3.1.
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Old Jan 7, 2011 | 10:08 PM
  #6  
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Re: 2.8 heads on 3.1 ??

because i already have 3 good sets and it would only cost me the price of gaskets
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Old Jan 8, 2011 | 10:43 AM
  #7  
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Re: 2.8 heads on 3.1 ??

Doesn't the 3.1 already have heads on it?
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Old Jan 8, 2011 | 10:11 PM
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Re: 2.8 heads on 3.1 ??

I think he's trying to say there's something wrong with the current heads on the 3.1... so he wanted to swap on a set of 2.8 heads.
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Old Jan 9, 2011 | 01:37 AM
  #9  
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Re: 2.8 heads on 3.1 ??

Originally Posted by CgMcKinney
I think he's trying to say there's something wrong with the current heads on the 3.1... so he wanted to swap on a set of 2.8 heads.


And what do you mean H.O? I thought the only difference in gen 1 heads was that pre 85 ones had ever so slightly smaller valves??
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Old Jan 9, 2011 | 08:56 AM
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Re: 2.8 heads on 3.1 ??

Originally Posted by 3rd gen RS


And what do you mean H.O? I thought the only difference in gen 1 heads was that pre 85 ones had ever so slightly smaller valves??
The "H.O." Heads were the pre '86 "performance" head for the 2.8, that are basically the same as the post '85 head. The H.O. head was used on cars like the Citation X-11 and other "performance models."
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Old Jan 9, 2011 | 01:07 PM
  #11  
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Re: 2.8 heads on 3.1 ??

Originally Posted by 3rd gen RS


And what do you mean H.O? I thought the only difference in gen 1 heads was that pre 85 ones had ever so slightly smaller valves??
Oh btw, the answer was yes... the heads will fit.
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