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RE: 390GT using 428 CJ Exhaust Manifolds
By John Bednorz - 03/15/2005 11:48:49 AM; IP 198.246.249.35
If your 390 motor still has the original heads it has what is known as the "14-bolt" exhaust pattern. There will be 14 threaded bolt holes on the exhaust side of the heads. Three of the exhaust ports will have four mounting holes (two horizontal and two vertical). The fourth port will have only two vertical holes. There were special exhaust manifolds made for this bolt pattern and they are commonly known as 390GT exhaust manifolds.

Cobra Jet exhaust manifolds were designed for the "16-bolt" pattern on the Cobra Jet heads, where each exhaust port has two horizontal and two vertical bolt holes surrounding it. IIRC Cobra Jet exhaust manifolds will bolt up properly to all the 390GT exhaust ports except for the rear ones.

Passenger car heads only have 8 exhaust holes - 2 vertical holes on each port. You need headers to use these heads in a Mustang.

Before ordering headers you need to ascertain which heads (and which exhaust bolt pattern) you have.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=24290&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24290" onclick="return false;">390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>Walter, <i>03/15/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24290', contentMargin: 60, icon: $('anchor24290') }); </script>  390GT using 428 CJ Exhaust Manifolds -- Walter, 03/15/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24291&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24291" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>Ken, <i>03/15/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24291', contentMargin: 60, icon: $('anchor24291') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- Ken, 03/15/2005
 RE: 390GT using 428 CJ Exhaust Manifolds -- Barry B, 03/15/2005
 RE: 390GT using 428 CJ Exhaust Manifolds -- walt, 04/17/2005
Collapse <b>RE: 390GT using 428 CJ Exhaust Manifolds</b>&nbsp;-- <font color=#0000ff>John Bednorz, <i>03/15/2005</i></font>RE: 390GT using 428 CJ Exhaust Manifolds -- John Bednorz, 03/15/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24294&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24294" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>Walter, <i>03/15/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24294', contentMargin: 60, icon: $('anchor24294') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- Walter, 03/15/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24295&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24295" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>The Jet, <i>03/15/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24295', contentMargin: 60, icon: $('anchor24295') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- The Jet, 03/15/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24297&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24297" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>Walter, <i>03/15/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24297', contentMargin: 60, icon: $('anchor24297') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- Walter, 03/15/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24298&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24298" onclick="return false;">The bad news is you are very mistaken</a>&nbsp;-- <font color=#0000ff>hawkrod, <i>03/15/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24298', contentMargin: 60, icon: $('anchor24298') }); </script>  The bad news is you are very mistaken -- hawkrod, 03/15/2005
 RE: The bad news is you are very mistaken -- Walter, 03/15/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24305&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24305" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>The Jet, <i>03/16/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24305', contentMargin: 60, icon: $('anchor24305') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- The Jet, 03/16/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24307&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24307" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>Walter, <i>03/16/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24307', contentMargin: 60, icon: $('anchor24307') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- Walter, 03/16/2005
 RE: 390GT using 428 CJ Exhaust Manifolds -- Fatblockford, 03/17/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24322&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24322" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>zane, <i>03/18/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24322', contentMargin: 60, icon: $('anchor24322') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- zane, 03/18/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24370&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24370" onclick="return false;">RE: 390GT using 428 CJ Exhaust Manifolds</a>&nbsp;-- <font color=#0000ff>Walter, <i>03/24/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24370', contentMargin: 60, icon: $('anchor24370') }); </script>  RE: 390GT using 428 CJ Exhaust Manifolds -- Walter, 03/24/2005
Collapse <a href=../ForumFE/reply.aspx?ID=24375&Reply=24290><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24375" onclick="return false;">CJ exhaust manifolds work great on 390GT heads</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>03/25/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24375', contentMargin: 60, icon: $('anchor24375') }); </script>  CJ exhaust manifolds work great on 390GT heads -- Royce Peterson, 03/25/2005
 RE: CJ exhaust manifolds work great on 390GT heads -- walt, 04/17/2005
 The good news: CJ exhaust manifolds are worth $$$. :-) [n/m] -- Mr F, 03/19/2005
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