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Original Message
Dual pattern cams....
By Royce Peterson - 12/13/2002 10:20:42 AM; IP 198.81.27.8
Actually there are reasons to go either way. A dual pattern cam can give you a decent idle with good idle vacuum but still pull hard at higher RPM's.

A single pattern cam can be a good choice for a targeted RPM range. It will give better power in its range than a dual pattern cam of similar lift and duration.

In the case off the 268H the cam is designed for good mid range power in an engine with 410 - 428 CI. It is a single pattern cam. Single pattern means identical lobe design on intake and exhaust. Here's a link to the specs:
http://www.compcams.com/catalog/174_175.html#Anchor


Like Gerry says the FE actually has good exhaust ports compared to something like a small block Ford.

Royce
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=15606&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15606" onclick="return false;">How do FEs like dual pattern cams?</a>&nbsp;-- <font color=#0000ff>Chuck Brandt, <i>12/11/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15606', contentMargin: 60, icon: $('anchor15606') }); </script>  How do FEs like dual pattern cams? -- Chuck Brandt, 12/11/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15607&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15607" onclick="return false;">RE: How do FEs like dual pattern cams?</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>12/11/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15607', contentMargin: 60, icon: $('anchor15607') }); </script>  RE: How do FEs like dual pattern cams? -- Gerry Proctor, 12/11/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15637&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15637" onclick="return false;">Comp cams says they like them pretty well..</a>&nbsp;-- <font color=#0000ff>James, <i>12/13/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15637', contentMargin: 60, icon: $('anchor15637') }); </script>  Comp cams says they like them pretty well.. -- James, 12/13/2002
Dual pattern cams.... -- Royce Peterson, 12/13/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15692&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15692" onclick="return false;">268AH-10 Comp Cam Specs right from the sheet.</a>&nbsp;-- <font color=#0000ff>James, <i>12/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15692', contentMargin: 60, icon: $('anchor15692') }); </script>  268AH-10 Comp Cam Specs right from the sheet. -- James, 12/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15699&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15699" onclick="return false;">James, you said 268H in your original post.</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>12/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15699', contentMargin: 60, icon: $('anchor15699') }); </script>  James, you said 268H in your original post. -- Royce Peterson, 12/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15716&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15716" onclick="return false;">A thousand pardons for my oversite...</a>&nbsp;-- <font color=#0000ff>James, <i>12/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15716', contentMargin: 60, icon: $('anchor15716') }); </script>  A thousand pardons for my oversite... -- James, 12/15/2002
 Run adjustable rockers over .500 lift -- james, 08/29/2005
Collapse <a href=../ForumFE/reply.aspx?ID=25669&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor25669" onclick="return false;">James tell me about your Comp Cams 268AH?</a>&nbsp;-- <font color=#0000ff>KSKI, <i>08/29/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=25669', contentMargin: 60, icon: $('anchor25669') }); </script>  James tell me about your Comp Cams 268AH? -- KSKI, 08/29/2005
 RE: James tell me about your Comp Cams 268AH? -- james, 08/29/2005
Collapse <a href=../ForumFE/reply.aspx?ID=15642&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15642" onclick="return false;">RE: 352 pistons?</a>&nbsp;-- <font color=#0000ff>SDP, <i>12/13/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15642', contentMargin: 60, icon: $('anchor15642') }); </script>  RE: 352 pistons? -- SDP, 12/13/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15646&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15646" onclick="return false;">RE: 352 pistons?</a>&nbsp;-- <font color=#0000ff>Chuck Brandt, <i>12/13/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15646', contentMargin: 60, icon: $('anchor15646') }); </script>  RE: 352 pistons? -- Chuck Brandt, 12/13/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15690&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15690" onclick="return false;">RE: 352 valve size</a>&nbsp;-- <font color=#0000ff>SDP, <i>12/14/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15690', contentMargin: 60, icon: $('anchor15690') }); </script>  RE: 352 valve size -- SDP, 12/14/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15691&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15691" onclick="return false;">RE: 352 valve size</a>&nbsp;-- <font color=#0000ff>Chuck Brandt, <i>12/14/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15691', contentMargin: 60, icon: $('anchor15691') }); </script>  RE: 352 valve size -- Chuck Brandt, 12/14/2002
 RE: Cam -- SDP, 12/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=25688&Reply=15606><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor25688" onclick="return false;">RE: How do FEs like dual pattern cams?</a>&nbsp;-- <font color=#0000ff>giacamo, <i>08/30/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=25688', contentMargin: 60, icon: $('anchor25688') }); </script>  RE: How do FEs like dual pattern cams? -- giacamo, 08/30/2005
 RE: How do FEs like dual pattern cams? -- walt, 09/09/2005
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