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What's the deal with 390GT heads and manifolds?
By Scott G. - 06/15/2002 1:30:48 PM; IP 168.11.129.200


I have a 67 390 mustang and want to beef its power output. I have heard the exhaust manifolds are a weak link. Are 428CJ heads a better upgrade, or can I get what I need from the GT heads with some modification to them? Likewise, should 428CJ manifolds replace the GT units? Or could I Extrude Hone the GT units? I want the engine to look factory(no headers). I have a 428PI intake to add. My goal is to add 50 to 75 horsepower and significant torque above the stock engine
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Collapse <b>What's the deal with 390GT heads and manifolds?</b>&nbsp;-- <font color=#0000ff>Scott G., <i>06/15/2002</i></font>What's the deal with 390GT heads and manifolds? -- Scott G., 06/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=13353&Reply=13352><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor13353" onclick="return false;">RE: What's the deal with 390GT heads and manifolds?</a>&nbsp;-- <font color=#0000ff>Tom, <i>06/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=13353', contentMargin: 60, icon: $('anchor13353') }); </script>  RE: What's the deal with 390GT heads and manifolds? -- Tom, 06/15/2002
 RE: What's the deal with 390GT heads and manifolds? -- pankoke, 04/01/2003
 Which heads ya got? -- Dave Shoe, 06/15/2002
 That sounds like a good plan. -- Royce Peterson, 04/01/2003
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