I'm putting a set of Langdon's cast headers, and an Offy aluminum 4bbl intake on my 64 Chevrolet C10 with a 292. The flanges on them interfere with each other when trying to mount them on the head. There is no way to get both the intake, and exhaust in place. They simply get in each others way. It appears that both Langdon's headers, and Offy's intake have flanges a little larger than the stock exhaust, and intake. This may be fine when used with the stock equipment, but, it just isn't jiving when used together. Considering the coin I've got in to all of this, I'm not super impressed. So, anyone else run in to this problem? I'm really not interested in getting out the die grinder on a bunch of brand new parts. Emails have been sent to both Langdon, and Summit. I wouldn't expect to hear anything on a Sunday, so, that's why I'm here.
I have an unknown set of after market headers and a Offy 4bbl intake and had to do a little bit of filing on the intake flange to get em to match up. I have seen several threads on various sites discussing the same issue so I think it's pretty common. Mine is also a 292. Getting everything to seal up good was a pain in the a**. After much research I used rounded ball washers from the top of the rocker arms that were left over. Putting them over the manifold bolts and really torquing down finally got it to seal up. Also coated the Felpro steel gasket with copper RTV.
Yeah, like seacat said, a bit of filing or grinding is somethimes necessary to get them to fit. Tightening them up is also a pain, as they are usually different thicknesses. I found special washers in McMaster Carr's catalog that will tighten up uneven flanges with even torque. They are 2 piece washers, with a male/female spherical surface between the 2 pieces. Worked great on my 292.
You have to cut a piece off each of the intake. It's says so in the paper work, you can make quick work of it in the band saw or with a cut off wheel. Here is what it will look like. John "The less you know, the more you think you know... The more you know, the less you think you know"
Check out REMFLEX for gaskets also. They are almost magical, the way they work. Sealed up my fentons/offy intake to my 235 like a champ
What has the out come been? "The less you know, the more you think you know... The more you know, the less you think you know"
Langdon emailed that the flange on the Offenhauser intake needs to have the ears cut off to make this work. Those that said this information is in the instructions are correct. I had read the instructions when I pulled these headers out of the box, but, that was awhile back. So, be warned, if you decide to run Langdon's cast headers, be prepared to take a saw to other not cheap speed parts. I emailed him back that I think this information should be included in his online catalog, but, that would probably cut in to his sales. John~N~Dallas, Thank you for your pictures, they are dead on accurate of what needs to be done. Aside from that, I have been cleaning the engine. Someone painted it SBC orange along the way, and I'm thinking about painting it back as close to the original blueish green that I can. I have some Poncho blue that I may use. I also ordered some equalizing washers from McMaster-Carr that should get here today. They look pretty slick, and hopefully help with the sealing.
Good I'm glad it helped .. John "The less you know, the more you think you know... The more you know, the less you think you know"
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