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68 427 Heads vs 68 1/2 CJ heads
By Royce Peterson - 09/22/2001 9:12:46 AM; IP 152.163.201.67
The heads are machined the same on the intake side with CJ / Low Riser style ports. On the exhaust side the 428CJ has a higher port opening and 16 bolt pattern to match the CJ exhaust manifolds. The 68 427 used Mustang ex - manifolds with 14 holes drilled in the heads and a lower hole in the casting.
427 head castings: C80E-H, C80E-J, C80E-N
68 1/2 428CJ head castings : C80E-J, C80E-N
Note that these castings must be identified by their machining characteristics on the exhaust side, the same number can mean different things.

Intake manifold on the 68 427 is the aluminum C7 AE intake sometimes called the PI. 68 1/2 CJ engines have the cast iron intake which is similar in appearance but actually changed quite a bit if you look at them side by side.

The 427 uses a 600 CFM Holley and the CJ a 735 CFM Holley.

Royce Peterson
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Collapse <a href=../ForumFE/reply.aspx?ID=8203&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8203" onclick="return false;">Crank questions</a>&nbsp;-- <font color=#0000ff>Greg Gilliam, <i>09/18/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8203', contentMargin: 60, icon: $('anchor8203') }); </script>  Crank questions -- Greg Gilliam, 09/18/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8204&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8204" onclick="return false;">RE: Crank questions</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>09/18/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8204', contentMargin: 60, icon: $('anchor8204') }); </script>  RE: Crank questions -- Royce Peterson, 09/18/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8205&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8205" onclick="return false;">RE: Crank questions</a>&nbsp;-- <font color=#0000ff>Greg Gilliam, <i>09/18/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8205', contentMargin: 60, icon: $('anchor8205') }); </script>  RE: Crank questions -- Greg Gilliam, 09/18/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8206&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8206" onclick="return false;">RE: Crank questions</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>09/18/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8206', contentMargin: 60, icon: $('anchor8206') }); </script>  RE: Crank questions -- Royce Peterson, 09/18/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8208&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8208" onclick="return false;">RE: Crank questions</a>&nbsp;-- <font color=#0000ff>Greg Gilliam, <i>09/18/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8208', contentMargin: 60, icon: $('anchor8208') }); </script>  RE: Crank questions -- Greg Gilliam, 09/18/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8213&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8213" onclick="return false;">RE: Crank questions</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>09/19/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8213', contentMargin: 60, icon: $('anchor8213') }); </script>  RE: Crank questions -- Royce Peterson, 09/19/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8220&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8220" onclick="return false;">Hey Royce, 428CJ or 427GTE which is faster ?</a>&nbsp;-- <font color=#0000ff>Skip C., <i>09/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8220', contentMargin: 60, icon: $('anchor8220') }); </script>  Hey Royce, 428CJ or 427GTE which is faster ? -- Skip C., 09/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8221&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8221" onclick="return false;">RE: Hey Royce, 428CJ or 427GTE which is faster ?</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>09/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8221', contentMargin: 60, icon: $('anchor8221') }); </script>  RE: Hey Royce, 428CJ or 427GTE which is faster ? -- Royce Peterson, 09/20/2001
 RE: Hey Royce, Thanks for the input ! -- Skip C., 09/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8254&Reply=8203><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8254" onclick="return false;">RE: Hey Royce, 428CJ or 427GTE which is faster ?</a>&nbsp;-- <font color=#0000ff>mikeb, <i>09/21/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8254', contentMargin: 60, icon: $('anchor8254') }); </script>  RE: Hey Royce, 428CJ or 427GTE which is faster ? -- mikeb, 09/21/2001
Collapse <b>68 427 Heads vs 68 1/2 CJ heads</b>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>09/22/2001</i></font>68 427 Heads vs 68 1/2 CJ heads -- Royce Peterson, 09/22/2001
 Picture C80E-N 427 head -- Royce Peterson, 09/22/2001
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