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  #1  
Old 07-19-2007, 12:05 AM
El Guapo El Guapo is offline
El Guapo and La Chiquita
 
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Default 14 bolt to 8 bolt

Will a 14 bolt exhaust adapt to an 8?
found a pair of 390GT heads with a 14 bolt pattern.My manifolds are 8
Is it safe to drill and tap holes to adapt my exhaust as long as we dont go to deep.
Are there exhaust for the squarebirds that will bolt to a GT

Last edited by El Guapo : 07-19-2007 at 01:46 AM.
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  #2  
Old 07-19-2007, 03:51 AM
FeFranco FeFranco is offline
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FeFranco
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I believe they will not. You may have to drill in 4 new holes. You may want to talk to Stan at FPA in Washington (close by) and see if his TBird headers would work with 14 bolt heads. FYI, they are about $700 and may not be that easy of an installation, but they sure look good when you pop the hood! What is the status of your EDC heads?
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  #3  
Old 07-19-2007, 10:16 AM
El Guapo El Guapo is offline
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I believe it's the valve seals.Maybe a burnt valve.
Getting oil in the front 2 cylinders on the pass.side.
Smokes pretty good.Mostly when its warm.
I can pick up a set of c6ae-u in great shape for $100 or 390 gt c8ae-h with new valves for $250.Claims 334hp but are 14 bolt pattern.
Wouldn't the HP's be better?
I can install one of these and have mine redone?
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  #4  
Old 07-19-2007, 11:10 PM
FeFranco FeFranco is offline
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The c6ae-u heads have a small chamber (67-70cc) which you will have to determine weather or not they will work for you. They may have a different location for the exhaust ports too, so your exhaust manifolds MIGHT not work (check first). Since they have smaller ports they may have more compression (power), but you may ping with 91 octain. These heads are are nothing special and common for '66, '67 352's, 390's.
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  #5  
Old 07-20-2007, 12:20 AM
El Guapo El Guapo is offline
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Gonna try and replace the seals and see if that works and rebuild this winter.Should I search for new(better )heads?
Or rebuild my edc-e heads?
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  #6  
Old 07-20-2007, 03:23 AM
FeFranco FeFranco is offline
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Here are 2 #'s of machine shops that have good knowledge for FE heads, they are located in Seattle. Bliss Performance (253) 847-2742 and Aire Research (253) 848-1628. I have not delt with them personally, but it wouldn't hurt for you to give them a call.
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