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Original Message
Here's the 1968 spec for the GT 500 KR
By P - 11/21/2001 11:58:10 AM; IP 66.89.75.42
Well, let me say this is the spec I found, hope it's valid for the Shelby stage of tune.

GT 500 KR Engine Specifications
Horsepower 335 @ 5,600 RPM
Torque 440 @ 3,400 RPM
Displacement 428 CI
Bore 4.12 inches
Stroke 3.98 inches
Compression ratio 10.7:1
Cylinder Heads & Valves Large intake port with 2.06" intake valves, 1.625" exhaust valves
Intake Manifold Large iron version of aluminum manifold
Exhaust Manifold New version
Carburetor 735 cfm 4V
Rocker Arms 1.73:1
Tappet - Cam Hydraulic Lifters and Cam
Oil Pan Conventional Ford 428
Cam Shaft Lift .481 Intake.490 Exhaust
Cam Shaft Duration 290 Degrees

I'm going to have to say that horsepower rating looks a bit anemic, with what they're dealing with. My guess is the car was putting out 375-HP or so with these specs.

P
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=9380&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9380" onclick="return false;">'66 Cobras with 428-what differences from 427</a>&nbsp;-- <font color=#0000ff>charlie, <i>11/19/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9380', contentMargin: 60, icon: $('anchor9380') }); </script>  '66 Cobras with 428-what differences from 427 -- charlie, 11/19/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9389&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9389" onclick="return false;">RE: '66 Cobras with 428-what differences from 427</a>&nbsp;-- <font color=#0000ff>Mel Clark, <i>11/19/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9389', contentMargin: 60, icon: $('anchor9389') }); </script>  RE: '66 Cobras with 428-what differences from 427 -- Mel Clark, 11/19/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9415&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9415" onclick="return false;">RE: '66 Cobras with 428-what differences from 427</a>&nbsp;-- <font color=#0000ff>P, <i>11/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9415', contentMargin: 60, icon: $('anchor9415') }); </script>  RE: '66 Cobras with 428-what differences from 427 -- P, 11/20/2001
 Re: amen! -- Mel Clark, 11/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9423&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9423" onclick="return false;">RE: '66 Cobras with 428-what differences from 427</a>&nbsp;-- <font color=#0000ff>charlie, <i>11/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9423', contentMargin: 60, icon: $('anchor9423') }); </script>  RE: '66 Cobras with 428-what differences from 427 -- charlie, 11/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9433&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9433" onclick="return false;">RE: '66 Cobras with 428-what differences from 427</a>&nbsp;-- <font color=#0000ff>Mel Clark, <i>11/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9433', contentMargin: 60, icon: $('anchor9433') }); </script>  RE: '66 Cobras with 428-what differences from 427 -- Mel Clark, 11/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9442&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9442" onclick="return false;">'67 428 PI - that's the key.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>11/20/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9442', contentMargin: 60, icon: $('anchor9442') }); </script>  '67 428 PI - that's the key. -- Dave Shoe, 11/20/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9451&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9451" onclick="return false;">RE: '67 428 PI - that's the key.</a>&nbsp;-- <font color=#0000ff>charlie, <i>11/21/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9451', contentMargin: 60, icon: $('anchor9451') }); </script>  RE: '67 428 PI - that's the key. -- charlie, 11/21/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9455&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9455" onclick="return false;">RE: What's he building?</a>&nbsp;-- <font color=#0000ff>Mel Clark, <i>11/21/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9455', contentMargin: 60, icon: $('anchor9455') }); </script>  RE: What's he building? -- Mel Clark, 11/21/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9467&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9467" onclick="return false;">RE: What's he building?</a>&nbsp;-- <font color=#0000ff>charlie, <i>11/21/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9467', contentMargin: 60, icon: $('anchor9467') }); </script>  RE: What's he building? -- charlie, 11/21/2001
 RE: What's he building? -- Mel Clark, 11/21/2001
Collapse <b>Here's the 1968 spec for the GT 500 KR</b>&nbsp;-- <font color=#0000ff>P, <i>11/21/2001</i></font>Here's the 1968 spec for the GT 500 KR -- P, 11/21/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9468&Reply=9380><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9468" onclick="return false;">RE: Here's the 1968 spec for the GT 500 KR</a>&nbsp;-- <font color=#0000ff>charlie, <i>11/21/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9468', contentMargin: 60, icon: $('anchor9468') }); </script>  RE: Here's the 1968 spec for the GT 500 KR -- charlie, 11/21/2001
 RE: 1968 spec for the GT 500 KR -- P, 11/21/2001
 RE: Here's the 1968 spec for the GT 500 KR -- Bob, 11/21/2001
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