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By pcmenten - 18 Years Ago
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I just received an exhaust manifold that I ordered from John Mummert. I was a little surprised as the mass of the item. As near as I can tell, it's about 18 pounds (8.2 kilos). Does anybody have an original, stock rams horn that they could weight for comparison purposes.
The part looks beautiful. It looks like I'll have to relieve some of the bolt holes for the exhaust studs to get a good seat for the nut, but the quality looks good otherwise.
Thanks in advance.
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By 46yblock - 18 Years Ago
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I just weighed a stock Ram Horn and it is 12 lbs 10 oz on the better scale, and 12 pounds on the bathroom scale.
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By pcmenten - 18 Years Ago
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Thanks Mike. I'm hoping the extra 5 pounds of my manifold won't be a problem. Sure is purty. 
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By Pete 55Tbird - 18 Years Ago
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Hi; Just a thought. Where do you suppose that extra 5 lbs of cast iron is. Inside the manifold? Wouldn`t that make it smaller inside?
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By 46yblock - 18 Years Ago
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PC, it is too bad you even know about the weight difference. Just enjoy your dual Rams Horn exhaust. My dream of a dual RH setup ended this week. My final plan to get the DS to work with the obstructions was to have its mounting surface milled for .165 more off the bottom of the surface than the top, tilting the outlet inboard. Did a trial setup before spending the money on milling, and there is no way to plumb in the pipe. Next plan is to find some cheap SBC headers that can be modified to exit into inner fender.
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By MoonShadow - 18 Years Ago
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I'm sure that if Mummert designed the Rams Horns the weight is in the metal and not the passages. He's too much of a Y-Block Hot Rodder to do that. Check Speedway for Y-Block fenderwells at: http://www.speedwaymotors.com/p/5999,,_1953-56-F100-Fenderwell-Y-Block-Headers.html?itemNo=y-block Chuck
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By Glen Henderson - 18 Years Ago
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Darn if those don't look real close to an old set of 57 car fenderwells that I have.
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By MoonShadow - 18 Years Ago
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I always thought they were the same. Someone correct me if I'm wrong (again). Chuck
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By Pete 55Tbird - 18 Years Ago
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You could check the internal capacity of the new manifold vs the old stock manifold by filling both with sand/salt/etc. and compareing the volumn.
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By pcmenten - 18 Years Ago
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Pete, I think Mummert's rams horns are well designed. I suspect that the extra weight is partially to avoid the kind of cracking that's typical of the original parts as well as to make the flanges, etc. a little beefier. I think that a factory part would have erred on the side of less weight at the expense of reliability. Also, although the quality of the part is very good, I don't think that whoever made the molds was overly concerned about weight. My one concern is that the mass of the part does not give it so much inertia that it 'wobbles' on its studs and leaks. I notice that the part is balanced on the axis of the exhaust bolt holes - that helps.
As for performance, the ports look beautiful. No worries there. This will be on the driver's side of a 54 F100, first on a 292 and then maybe later on a 312. Passenger side will probably get a passenger car manifold.
Now, I'm trying to justify the cost of a ceramic coating.
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