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Spark plugs for my 428?
By John - 10/16/2005 8:59:54 PM; IP 142.177.93.69
I have been using Champion RF9YC plugs in my 428. Engine is 9.5:1 CR, 4X2 Carbs, headers into dual side exhaust, and according to Crane's computer profiling, can put out 480 Hp (I dont' think so, but maybe...). Anyway, the plugs slowly took on a nice tan colour, but by 3500 miles started to misfire the odd time, although some serious acceleration would clear the plugs. Plugs now have a gray coating over the center insulator which I can pick off with a fingernail. Should I go a couple sizes colder? Maybe a RF7YC? Oh...I use 91 Octane pump gas.

Also, please no dumping on Champion...they have always worked fine for me. Besides..... for those of you who insist on AC Delco, the AC stands for Albert Champion.
This thread, so far...
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Collapse <b>Spark plugs for my 428?</b>&nbsp;-- <font color=#0000ff>John, <i>10/16/2005</i></font>Spark plugs for my 428? -- John, 10/16/2005
Collapse <a href=../ForumFE/reply.aspx?ID=25995&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor25995" onclick="return false;">Colder plugs foul quicker. Go the other way. N/M</a>&nbsp;-- <font color=#0000ff>Royce P, <i>10/16/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=25995', contentMargin: 60, icon: $('anchor25995') }); </script>  Colder plugs foul quicker. Go the other way. N/M -- Royce P, 10/16/2005
Collapse <a href=../ForumFE/reply.aspx?ID=25997&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor25997" onclick="return false;">True, but.....?</a>&nbsp;-- <font color=#0000ff>John, <i>10/16/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=25997', contentMargin: 60, icon: $('anchor25997') }); </script>  True, but.....? -- John, 10/16/2005
Collapse <a href=../ForumFE/reply.aspx?ID=26004&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor26004" onclick="return false;">Rf12yc</a>&nbsp;-- <font color=#0000ff>Cobra428, <i>10/17/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=26004', contentMargin: 60, icon: $('anchor26004') }); </script>  Rf12yc -- Cobra428, 10/17/2005
Collapse <a href=../ForumFE/reply.aspx?ID=26005&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor26005" onclick="return false;">RE: Rf12yc</a>&nbsp;-- <font color=#0000ff>John, <i>10/17/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=26005', contentMargin: 60, icon: $('anchor26005') }); </script>  RE: Rf12yc -- John, 10/17/2005
Collapse <a href=../ForumFE/reply.aspx?ID=26006&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor26006" onclick="return false;">Just wondering what type ignition you have.</a>&nbsp;-- <font color=#0000ff>Royce P, <i>10/17/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=26006', contentMargin: 60, icon: $('anchor26006') }); </script>  Just wondering what type ignition you have. -- Royce P, 10/17/2005
Collapse <a href=../ForumFE/reply.aspx?ID=26008&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor26008" onclick="return false;">My Ignition</a>&nbsp;-- <font color=#0000ff>John, <i>10/17/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=26008', contentMargin: 60, icon: $('anchor26008') }); </script>  My Ignition -- John, 10/17/2005
Collapse <a href=../ForumFE/reply.aspx?ID=26009&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor26009" onclick="return false;">RE: My Ignition</a>&nbsp;-- <font color=#0000ff>Royce P, <i>10/17/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=26009', contentMargin: 60, icon: $('anchor26009') }); </script>  RE: My Ignition -- Royce P, 10/17/2005
Collapse <a href=../ForumFE/reply.aspx?ID=26063&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor26063" onclick="return false;">Ah hah!...something unexpected</a>&nbsp;-- <font color=#0000ff>John, <i>11/01/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=26063', contentMargin: 60, icon: $('anchor26063') }); </script>  Ah hah!...something unexpected -- John, 11/01/2005
 Well....phooey! -- John, 11/03/2005
Collapse <a href=../ForumFE/reply.aspx?ID=26081&Reply=25994><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor26081" onclick="return false;">RE: Ah hah!...something unexpected</a>&nbsp;-- <font color=#0000ff>walt, <i>11/05/2005</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=26081', contentMargin: 60, icon: $('anchor26081') }); </script>  RE: Ah hah!...something unexpected -- walt, 11/05/2005
 Royce is probably right -- John, 11/06/2005
 RE: Spark plugs for my 428? -- walt, 11/02/2005
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