Regarding what they look like:
The JBA dak headers are 409 stainless. They start out with tubes that are a
brush polished finish. after the bending and welding and handling the
headers have a dark patina on them. Once they are run (they had a few sets
installed and off laying around) they turn dark brown to black. They do not
rust. This is an oxide coating from the stainless constituents. the tubes
are 14-15 guage (stainless tubes are speced out strangely re;Guage). FYi,
409 stainless is a martensitic stainless steel and is composed of: 11.5-13.5
% chromium, .15% carbon max, 1% Mn, 1% Si max, 1-3% Ni, and of course steel.
FYI
BKB
At 10:41 AM 7/16/98 -0400, you wrote:
>>
>> 1. Are the HP and torque gains believable with a stock exhaust behind
>> the headers? I think I saw 20 more horses and something like 20-25
>> more ftlbs of torque.
>
>I really don't know what to tell you here . I know taht they are claiming
>17-22HP and like 20-25lb/ft of torque .
>>
>> 2. Will this make the truck noisy/loud like a race machine? Will it
>> change it at all? I'm all for more HP/torque but I'm not trying to
>> build a race machine... I'm more into the 4 wheeling stuff.
>
>I would throw that question to those in the group that have had experience
>iwith headers on their Daks , specifically , shorty headers on a 4x4 .
>>
>> 3. Speaking of 4 wheeling... Any down side there with mud/snow/crud
>> being sprayed all over them? I would think stainless would be more
>> durable, but I thought I'd ask anyway.
>>
>As I understand it , Jeff at JBA tells me that the standard headers that
>are stainless steel , are not polished and have no real finish . He says
>that after a few uses and heating/cooling periods , that they will most
>likely turn a very dark color , almost black , but that they will NOT rust
>. He says that these are designed for those who are looking for performance
>. He says that the coated version not only reduces underhood temps , but it
>is also polished to a chrome-like finish .
>
>I would think that they wouldn't be affected by any water or debris such as
>mud , but I'll ask later on today in my daily talk with him , heh heh .
>
>
>
>> T.
>>
>> P.S. Congrat's to all who have worked out/done the leg work on this
>> great deal!!
>>
>>
>>
>
>
>
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