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Original Message
RE: Another opinion.
By Gerry Proctor - 11/30/2004 7:46:01 PM; IP 216.12.192.75
If you're referring to a chassis dyno, those power and torque numbers don't sound bad at all for what you're indicating. I think you're too hung up on an arbitrary number. How the truck feels to the throttle in the seat of your pants is a more important issue. And a CC 268 is a fairly mild cam in a 390. It's made for more low rpm grunt. And a 750 CFM 3310 Holley isn't too big for a 390. About the only thing you'd notice by going to a 600 CFM carb is that the boosters are a bit more sensitive to tip in but you won't make more horsepower by going smaller (probably a bit less, if anything).

I seriously doubt that your true compression pressure is 100psi unless your cam is way out of whack or you're hanging valves. I think your test method is flawed (open throttle, hot engine, all plugs out, sufficient cranking rpm) otherwise your engine probably wouldn't even start.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=23368&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23368" onclick="return false;">&gt;&gt;New 390 is weak, need pointers&lt;&lt;</a>&nbsp;-- <font color=#0000ff>spinnerbait42, <i>11/27/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23368', contentMargin: 60, icon: $('anchor23368') }); </script>  >>New 390 is weak, need pointers<< -- spinnerbait42, 11/27/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23369&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23369" onclick="return false;">adding info 2 my setup</a>&nbsp;-- <font color=#0000ff>spinnerbait42, <i>11/27/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23369', contentMargin: 60, icon: $('anchor23369') }); </script>  adding info 2 my setup -- spinnerbait42, 11/27/2004
 RE: adding info 2 my setup -- giacamo, 11/28/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23399&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23399" onclick="return false;">Compression Info</a>&nbsp;-- <font color=#0000ff>spinnerbait42, <i>11/29/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23399', contentMargin: 60, icon: $('anchor23399') }); </script>  Compression Info -- spinnerbait42, 11/29/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23403&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23403" onclick="return false;">Eek! Compression Info Nasty</a>&nbsp;-- <font color=#0000ff>John, <i>11/29/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23403', contentMargin: 60, icon: $('anchor23403') }); </script>  Eek! Compression Info Nasty -- John, 11/29/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23405&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23405" onclick="return false;">Rebuild or Blower</a>&nbsp;-- <font color=#0000ff>Martin Micheelsen, <i>11/30/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23405', contentMargin: 60, icon: $('anchor23405') }); </script>  Rebuild or Blower -- Martin Micheelsen, 11/30/2004
 How about N2O!? -- spinnerbait42, 12/01/2004
Collapse <b>RE: Another opinion.</b>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>11/30/2004</i></font>RE: Another opinion. -- Gerry Proctor, 11/30/2004
 RE: Another opinion. -- spinnerbait42, 12/01/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23408&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23408" onclick="return false;">RE: &gt;&gt;New 390 is weak, need pointers&lt;&lt;</a>&nbsp;-- <font color=#0000ff>mikee likee, <i>12/01/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23408', contentMargin: 60, icon: $('anchor23408') }); </script>  RE: >>New 390 is weak, need pointers<< -- mikee likee, 12/01/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23410&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23410" onclick="return false;">RE: Another opinion</a>&nbsp;-- <font color=#0000ff>spinnerbait42, <i>12/01/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23410', contentMargin: 60, icon: $('anchor23410') }); </script>  RE: Another opinion -- spinnerbait42, 12/01/2004
 Remove ALL sparkplugs when doing compression test -- John, 12/01/2004
 RE: Another opinion -- mikee likee, 12/01/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23415&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23415" onclick="return false;">RE: Another opinion</a>&nbsp;-- <font color=#0000ff>giacamo, <i>12/01/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23415', contentMargin: 60, icon: $('anchor23415') }); </script>  RE: Another opinion -- giacamo, 12/01/2004
 RE: Another opinion -- Tim P., 12/05/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23613&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23613" onclick="return false;">Compression Test, Changed carb</a>&nbsp;-- <font color=#0000ff>spinnerbait42, <i>12/29/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23613', contentMargin: 60, icon: $('anchor23613') }); </script>  Compression Test, Changed carb -- spinnerbait42, 12/29/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23615&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23615" onclick="return false;">80k volts to plugs!</a>&nbsp;-- <font color=#0000ff>mikee likee, <i>12/29/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23615', contentMargin: 60, icon: $('anchor23615') }); </script>  80k volts to plugs! -- mikee likee, 12/29/2004
 RE: 80k volts to plugs! -- John, 12/29/2004
Collapse <a href=../ForumFE/reply.aspx?ID=23623&Reply=23368><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor23623" onclick="return false;">80kv! Give me a break!</a>&nbsp;-- <font color=#0000ff>spinnerbait42, <i>12/30/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=23623', contentMargin: 60, icon: $('anchor23623') }); </script>  80kv! Give me a break! -- spinnerbait42, 12/30/2004
 RE: 80kv! Give me a break! -- mikee likee, 12/30/2004
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