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Original Message
Those are raised-exit heads.
By Dave Shoe - 04/14/2002 10:57:42 PM; IP 63.233.226.246
C6AE-Rs differ from CJ heads in two ways - thay have an "anti-reversion" type lip at the exit of the exhaust port which can be ground away with little difficulty (making the high-exit more obvious), and they need to have the throats dressed to properly fit CJ valves. Once done, these flow about the same as CJ heads.

Note that CJ heads are cast for 2.03/1.55 valves just like all the other FE heads, but they were "dressed out" in the engine plant to fit the larger valves.

Also note the "AR" lip is probably not actually there for anti-reversion purposes. It's likely there to shrink up the high-exit exhaust runner in order to seal against the low-exit Fairlane/Mustang exhaust 390 manifold. I will refer to it as an "anti-reversion" lip until I lern more about it's design intent. It is a trianguular tab at the top of the exhaust port about 5/16" tall, and extends about 1/2" deep into the exhaust port, where it triangularly tapers down to nothing. Pretty darned easy to cut away. Easier than removing the thermactor bumps, for sure.

Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=12568&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12568" onclick="return false;">C6AE-R porting ?'s</a>&nbsp;-- <font color=#0000ff>mike allen, <i>04/14/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12568', contentMargin: 60, icon: $('anchor12568') }); </script>  C6AE-R porting ?'s -- mike allen, 04/14/2002
Those are raised-exit heads. -- Dave Shoe, 04/14/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12573&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12573" onclick="return false;">RE: C6AE-R porting ?'s</a>&nbsp;-- <font color=#0000ff>Ray, <i>04/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12573', contentMargin: 60, icon: $('anchor12573') }); </script>  RE: C6AE-R porting ?'s -- Ray, 04/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12574&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12574" onclick="return false;">RE: C4AE-6090 porting ex n/m</a>&nbsp;-- <font color=#0000ff>Ray, <i>04/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12574', contentMargin: 60, icon: $('anchor12574') }); </script>  RE: C4AE-6090 porting ex n/m -- Ray, 04/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12575&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12575" onclick="return false;">Nice job on those photos & scans, Ray. :-) [n/m]</a>&nbsp;-- <font color=#0000ff>Mr F, <i>04/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12575', contentMargin: 60, icon: $('anchor12575') }); </script>  Nice job on those photos & scans, Ray. :-) [n/m] -- Mr F, 04/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12576&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12576" onclick="return false;">RE: Nice but needs work . Ray</a>&nbsp;-- <font color=#0000ff>Ray Tirri, <i>04/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12576', contentMargin: 60, icon: $('anchor12576') }); </script>  RE: Nice but needs work . Ray -- Ray Tirri, 04/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12577&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12577" onclick="return false;">Why not start with a better head for porting?</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>04/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12577', contentMargin: 60, icon: $('anchor12577') }); </script>  Why not start with a better head for porting? -- Royce Peterson, 04/15/2002
 RE: Why not start with a better head for porting? -- mike allen, 04/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12580&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12580" onclick="return false;">RE: Why not, Because there-there!</a>&nbsp;-- <font color=#0000ff>Ray Tirri, <i>04/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12580', contentMargin: 60, icon: $('anchor12580') }); </script>  RE: Why not, Because there-there! -- Ray Tirri, 04/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12632&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12632" onclick="return false;">RE: Why not, Because there-there!</a>&nbsp;-- <font color=#0000ff>Bob, <i>04/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12632', contentMargin: 60, icon: $('anchor12632') }); </script>  RE: Why not, Because there-there! -- Bob, 04/17/2002
 RE: C.C.s Bob I will this week -- Ray, 04/18/2002
Collapse <a href=../ForumFE/reply.aspx?ID=12579&Reply=12568><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor12579" onclick="return false;">RE: C4AE-6090 porting ex n/m</a>&nbsp;-- <font color=#0000ff>mike allen, <i>04/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=12579', contentMargin: 60, icon: $('anchor12579') }); </script>  RE: C4AE-6090 porting ex n/m -- mike allen, 04/15/2002
 Almost. -- Dave Shoe, 04/15/2002
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