<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

I recently ordered a set of for my 68 F100 w/ stroked 390 FE project because I am pressed for time and I thought it would speed me up.<o:p></o:p>

<o:p></o:p>

http://store.summitracing.com/partdetail.asp?autofilter=1&part=HED%2D89100&N=700 +0&autoview=sku<o:p></o:p>

<o:p></o:p>

<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><v:shape id=_x0000_i1025 style="WIDTH: 300pt; HEIGHT: 299.25pt" alt="" type="#_x0000_t75"><v:imagedata o:href=\"http://static.summitracing.com/global/images/prod/large/hed-89100.jpg\" src="file:///C:/DOCUME~1/Family/LOCALS~1/Temp/msoclip1/01/clip_image001.jpg"></v:imagedata></v:shape>

Summit PT # HED-89100<o:p></o:p>

These are the first performance headers I have ever bought instead of Fabricated. I happen to be a welder by trade and after looking at the way they welded the tubes from the engine side it left me scratching my head (No Pun intended) over how they ever expect to get a seal?<o:p></o:p>

<o:p></o:p>

I have always used a flange cut from half-inch plate and the welds are on the outside away from the head.<o:p></o:p>

I plan to weld on an O2 sensor with a single gauge in the cab to help maximize tuning. Also I will apply a ceramic coat powder coating on the inside and out to reduce the heat under the hood. <o:p></o:p>

<o:p></o:p>

Does anyone see a problem other than warpage to me welding the outer side of these and cleaning the head side to smooth?

<o:p></o:p>

I’ll be able to control the heat and prevent the warp buy bolting the flange to a plate of aluminum. The aluminum draws the excess heat off so warpage is not really a problem. We use Copper at work but Aluminum is cheaper and easier to acquire for homework.<o:p></o:p>

<o:p></o:p>

Does anyone have any tips or suggestions?<o:p></o:p>

<o:p></o:p>

<o:p></o:p>

<o:p></o:p>

Thanks<o:p></o:p>

John

 

Those flanges are only 1/4" thick, add bolt torqure and heat they can warp and spit gaskets. I would run copper header and collector gaskets, install and forget for years. Doug Thorley headers to home made X cross HPC coated inside and out, coatings make a difference holding the heat in.