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Forums->Hot Heads Tech Talk->315 headers

Bbugger
315 headers


Hello all,

I am a current college student with a 1958 d-100 with a 315 hemi. I recently just had to take off my exhaust manifolds due to excessive cracking. I am very adimant on going ahead and putting headers on it. The only problem is I want stainless if I due end up putting them on. I'm trying to find a cheap set from a different brand of motor and weld them to my flanges. Has anyone ever done this and does anyone know any knowledge on other motors that has 1 3/4 exhaust ports and is 14 7/16 long from top center mounting holes.

Thanks anything will help!
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on: Fri 23 of Jun, 2017 [17:04 UTC] reads: 2487

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ron37
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Re: 315 headers
on: Sat 01 of Jul, 2017 [20:19 UTC] score: 0.00
Okay here is what I use. It may be more than you want to pay. I use 289/302 small block Ford Sprint/Roadster over the rail headers. I have bought the Speedway header kit $114 and 4 of the u-bends at 7.98 each with free shipping. They are 1 5/8" ID, which is correct for your engine. You could buy a used Sprint set someplace that is already welded or a new set for $155 at Speedway. I also buy a set of steel Dodge hemi header flanges at $45 plus ship. They list all parts on eBay. Here is the way I do it. I swap sides with the headers. That's right on left, left on right. With them parallel to the engine centerline, I cut the upper bends leading to the header flanges at about 41 degrees. This makes the cut 90 degrees to the side cylinder bank and head. I bolt the flanges to the heads. I cut the u-bends in half, so I get 2 - J's or elbows out of each. Then I fit each elbow in the flanges. I cut and fit the straight end to the header 41 degree bend. On the pre-welded headers, you'll have to bend a little on the tubes or cut and weld some down by the collector. That's why I like the kits, so I can slide the outer tubes closer, before I weld up the collector. Also depending on your style front engine mounts, you may have to add a little extra elbow on the 1 and 2 or front cylinders. I tack everything, then remove from engine, so I can do I final weld job. Then off to the ceramic coaters. So that's how I do it. Hope it works for you.

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Bbugger
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Re: 315 headers
on: Fri 30 of Jun, 2017 [04:27 UTC] score: 0.00
> Hello all,
>
> I am a current college student with a 1958 d-100 with a 315 hemi. I recently just had to take off my exhaust manifolds due to excessive cracking. I am very adimant on going ahead and putting headers on it. The only problem is I want stainless if I due end up putting them on. I'm trying to find a cheap set from a different brand of motor and weld them to my flanges. Has anyone ever done this and does anyone know any knowledge on other motors that has 1 3/4 exhaust ports and is 14 7/16 long from top center mounting holes.
>
> Thanks anything will help!

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DaveBlakeman
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Re: 315 headers
on: Sat 24 of Jun, 2017 [16:33 UTC] score: 0.00
Hot Heads sells headers for you but they are ceramic coated. If what you are calling flanges are plasma cut header fab plates then you can make an exhaust with TIG maybe . If you are talking about welding to your stock manifold flange forget it .

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Bbugger
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Re: Re: 315 headers
on: Fri 30 of Jun, 2017 [04:33 UTC] score: 0.00
> Hot Heads sells headers for you but they are ceramic coated. If what you are calling flanges are plasma cut header fab plates then you can make an exhaust with TIG maybe . If you are talking about welding to your stock manifold flange forget it .

Yes, we cut new flanges. I've heard if headers are not stainless they rust within 4 years. Whether that's true or not I'm not sure. I've never had a set of headers before. I just figured if I go with stainless I wouldn't have a problem with that. I am just trying to gain some knowledge about them at the moment.

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Jack
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Re: 315 headers
on: Fri 23 of Jun, 2017 [17:32 UTC] score: 0.00
My opinion is that a good ceramic coat are better than stainless.

Cheap set? You buy cheap you get cheap.

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Bbugger
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Re: Re: 315 headers
on: Fri 30 of Jun, 2017 [04:46 UTC] score: 0.00
> My opinion is that a good ceramic coat are better than stainless.
>
> Cheap set? You buy cheap you get cheap.

Also, when I said cheap I didn't mean dirt cheap set, my bad. My grandpa made a Ford set work on a dodge engine because the measurements for the exhaust ports and mounting bolts were almost identical. So I thought I might possibly be able to pick a set up meant for a Ford or chevy a little bit cheaper then if I were to go with a set made for dodge engines.question

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Bbugger
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Re: Re: 315 headers
on: Fri 30 of Jun, 2017 [04:35 UTC] score: 0.00
> My opinion is that a good ceramic coat are better than stainless.
>
> Cheap set? You buy cheap you get cheap.


Why do you say that? I've heard the ceramic coatings were a joke. So my initial thought was to just go with stainless. But again I've never had headers so I'm just trying to figure out what will last so I won't have to mess with it.

author message
Jack
user offline
Re: Re: Re: 315 headers
on: Fri 30 of Jun, 2017 [17:24 UTC] score: 0.00
A good ceramic coating will dissipate heat better and will last for years if done properly. I have a set of manifolds that have been on the car for about twenty years and they still look new. Another full exhaust system full length coated that is about ten years old and still shines like new.
I have seen some sets that are coated over seas when they are built that didn't last very well.
There is a place in Portland OR called SMS that does a good job.
However, it sounds like you are more into not spending much than getting the best job. Ceramic coating will cost you a bit.



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