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Original Message
The differences
By Royce Peterson - 07/10/2003 11:26:31 PM; IP 67.29.197.217
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=17771&Reply=17771><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17771" onclick="return false;">390 Truck vs. 390GT</a>&nbsp;-- <font color=#0000ff>Packman, <i>07/10/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=17771', contentMargin: 60, icon: $('anchor17771') }); </script>  390 Truck vs. 390GT -- Packman, 07/10/2003
Collapse <b>The differences</b>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>07/10/2003</i></font>The differences -- Royce Peterson, 07/10/2003
Collapse <a href=../ForumFE/reply.aspx?ID=17781&Reply=17771><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor17781" onclick="return false;">RE: The differences</a>&nbsp;-- <font color=#0000ff>Packman, <i>07/11/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=17781', contentMargin: 60, icon: $('anchor17781') }); </script>  RE: The differences -- Packman, 07/11/2003
 Headers -- Royce Peterson, 07/11/2003
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