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Original Message
1968 390GT heads are drilled for Thermactor.
By Dave Shoe - 10/21/2002 6:28:44 PM; IP 12.104.160.195
In 1966-67 only california 390GTs were drilled for Thermactor emissions.

In 1968, stricter national emissions regulations mean't all 390GT heads were drilled for Thermactor plumbing, and Thermactor pump systems were driven by a fan belt. The long-duration "GT" cam required an exhaust gas reactor to burn raw fuel which found it's way to the exhaust.

The 390GT was dropped for 1969 because the expense of Thermactor was too great. The 390GT lost the "long duration" GT cam and inherited the regular 390 cam, and thus the 390IP was born. For 1969, the 390IP engine was installed in 390 cars with the GT option.

If your heads have Thermactor, they're likely 390GT heads from 1968.

Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=14849&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14849" onclick="return false;">One more - trying to validate 390 GT!!</a>&nbsp;-- <font color=#0000ff>Patrick, <i>10/16/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14849', contentMargin: 60, icon: $('anchor14849') }); </script>  One more - trying to validate 390 GT!! -- Patrick, 10/16/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14850&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14850" onclick="return false;">It sounds like a 1966 engine.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>10/16/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14850', contentMargin: 60, icon: $('anchor14850') }); </script>  It sounds like a 1966 engine. -- Dave Shoe, 10/16/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14854&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14854" onclick="return false;">RE: It sounds like a 1966 engine.</a>&nbsp;-- <font color=#0000ff>Patrick, <i>10/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14854', contentMargin: 60, icon: $('anchor14854') }); </script>  RE: It sounds like a 1966 engine. -- Patrick, 10/17/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14855&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14855" onclick="return false;">I'm guessing switched, but dates would help. [n/m]</a>&nbsp;-- <font color=#0000ff>Mr F, <i>10/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14855', contentMargin: 60, icon: $('anchor14855') }); </script>  I'm guessing switched, but dates would help. [n/m] -- Mr F, 10/17/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14856&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14856" onclick="return false;">RE: I'm guessing switched, but dates would help. [n/m]</a>&nbsp;-- <font color=#0000ff>Patrick, <i>10/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14856', contentMargin: 60, icon: $('anchor14856') }); </script>  RE: I'm guessing switched, but dates would help. [n/m] -- Patrick, 10/17/2002
 'C6'-etc. is not a date. Here's where to look on the intake... -- Mr F, 10/17/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14865&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14865" onclick="return false;">...and here's a similar look at the exhaust manifolds.</a>&nbsp;-- <font color=#0000ff>Mr F, <i>10/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14865', contentMargin: 60, icon: $('anchor14865') }); </script>  ...and here's a similar look at the exhaust manifolds. -- Mr F, 10/17/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14905&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14905" onclick="return false;">RE: ...and here's a similar look at the exhaust manifolds.</a>&nbsp;-- <font color=#0000ff>Patrick, <i>10/21/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14905', contentMargin: 60, icon: $('anchor14905') }); </script>  RE: ...and here's a similar look at the exhaust manifolds. -- Patrick, 10/21/2002
Collapse <b>1968 390GT heads are drilled for Thermactor.</b>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>10/21/2002</i></font>1968 390GT heads are drilled for Thermactor. -- Dave Shoe, 10/21/2002
 RE: 1968 390GT heads are drilled for Thermactor. -- brian, 01/09/2006
 RE: It sounds like a 1966 engine. -- Patrick, 10/29/2002
Collapse <a href=../ForumFE/reply.aspx?ID=14853&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor14853" onclick="return false;">Any date codes on intake & exhaust manifolds? [n/m]</a>&nbsp;-- <font color=#0000ff>Mr F, <i>10/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=14853', contentMargin: 60, icon: $('anchor14853') }); </script>  Any date codes on intake & exhaust manifolds? [n/m] -- Mr F, 10/17/2002
 The date codes are against the head/block...... -- kevin, 10/17/2002
Collapse <a href=../ForumFE/reply.aspx?ID=24246&Reply=14849><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor24246" onclick="return false;">RE: One more - trying to validate 390 GT!!</a>&nbsp;-- <font color=#0000ff>Kevin John Conley, <i>03/09/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=24246', contentMargin: 60, icon: $('anchor24246') }); </script>  RE: One more - trying to validate 390 GT!! -- Kevin John Conley, 03/09/2005
 RE: One more - trying to validate 390 GT!! -- giacamo, 03/09/2005
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