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Original Message
The differences
By Royce Peterson - 07/11/2003 2:32:03 PM; IP 66.161.205.66
1. Different camshaft
2. Extra bolt pattern on the exhaust side of the heads. No difference in the heads themselves. Your exhaust manifolds probably flow equal to or better than 390GT.
3. Marginally stiffer valve springs
4. Different pistons. The 390 GT had 10.25 compression, your engine is around 9.0 because of different pistons. This accounts for most of the power difference.

Royce
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Collapse <a href=../ForumFE/reply.aspx?ID=17775&Reply=17775><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17775" onclick="return false;">This may be a real stupid one...here goes</a>&nbsp;-- <font color=#0000ff>ponyboy, <i>07/11/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=17775', contentMargin: 60, icon: $('anchor17775') }); </script>  This may be a real stupid one...here goes -- ponyboy, 07/11/2003
 Casting causes confusion - many FEs have '352' on the block. [n/m] -- Mr F, 07/11/2003
Collapse <b>The differences</b>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>07/11/2003</i></font>The differences -- Royce Peterson, 07/11/2003
Collapse <a href=../ForumFE/reply.aspx?ID=17778&Reply=17775><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17778" onclick="return false;">RE: Mustang 1967-70 390's almost always have .....</a>&nbsp;-- <font color=#0000ff>ponyboy, <i>07/11/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=17778', contentMargin: 60, icon: $('anchor17778') }); </script>  RE: Mustang 1967-70 390's almost always have ..... -- ponyboy, 07/11/2003
Collapse <a href=../ForumFE/reply.aspx?ID=17779&Reply=17775><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17779" onclick="return false;">RE: Mustang 1967-70 390's almost always have .....</a>&nbsp;-- <font color=#0000ff>Martin Micheelsen, <i>07/11/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=17779', contentMargin: 60, icon: $('anchor17779') }); </script>  RE: Mustang 1967-70 390's almost always have ..... -- Martin Micheelsen, 07/11/2003
 RE: Mustang 1967-70 390's almost always have ..... -- 390 ranger, 07/13/2003
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