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There is some merit in going with a very thin flange as this makes the header more likely to bond to the cylinder head as the material is more flexible compared to thicker steel. This translates to a cost saving for the fabricator as they wouldn't need to surface mill the flange if it is heavily warped (which is a pain the arse).

Thinner, lighter material may also dissipate heat faster making them less likely to deform during fabrication.

........Or it may simply be a fabricators preference. Either way if those are lightweight race specific headers I think they are brilliant, if one would prefer longevity then perhaps a heavy cast-iron alternative would be better.

One idea is tac weld a spacer on the flange where the washer sits. I used a nail the right thickness when I had to do it.

Sounds like a bargain: high quality + low price.

It is most for the header flange to be thinner than the cast intake flange. Spacers are used, I cannot find a pic but as I recall they are like a small steel plate with two bolt holes.

Sorry for never following this up. Kirk racing found his jig and made me one. The cost was around $250 at the time, but it took a while to get here. So long that I had forgotten that I had ordered it. All the sudden there was a charge on my card and 3 days later I had this large box on my doorstep. All in all it took like 2 months.

The only issue I have with the kirk headers is that the exhaust flange is so much thinner than my bogg r1 manifold. It's like 1/4inch thick vs almost 1/2inch on the bogg. I'll either have it modified or figure out a way to make them work.

This is the only picture I have of the headers. They've been in storage as the 4dr is on the back burner for a bit:

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Mine came from Nissan Motorsports and was purchased from Courtesy Nissan, but was made by Kirk Racing.

I am pretty sure Kirden got one from Kirk after talking to me?

http://www.kirkracing.com/headers.html



Oh, and I am known as "datsunfreak" on every forum but this one.

Hi Rick, I have emailed both Kirden and Datsunfreak so hopefully we'll see some more information in a couple of days.

I realize it's almost a year later, I'm looking for the same as you Kirden so - Did you have success?
Is there another choice for my A15?
I'm running an H89 head with a pair of HIF-4 SU carbs and it all sits in an MG Midget (Soon to become an Arkley SS).

I may have found a much better option stateside. The person I am talking to is trying to find his jig for the A-series, but if he finds it I will be getting the original Nismo B210 design. After coating the price is close to Bill's, but this set includes whichever flange I want welded to the outlet. 4 to 1, 1.5 primaries, 2.0 outlet.

Datsunfreak on ratsun.net is using the same headers on his 1200. I should have more info to share by the end of the week.

I assume you are talking about Bills Datsun Shoppe headers besides being four into one at least the length is OK and yes the merge is rubbish but you can buy a decent merge and get it swapped on for cheap and have a decent setup, I would go that way unless you want to learn how to sand bend and make your own top notch setup( It is not that hard and makes better bends than mandrel)

Burns Stainless also does merge collectors in mild steel lot cheaper than stainless and would fit up nice on Bills pipes
http://www.burnsstainless.com/mergecollectorsmain.aspx

Yea, that makes sense. My biggest issue with the datsun shoppe ones is that the merge is horrible. If you were to cut that off and make a swap to a longer merge they would be ok, but by then you are getting close to the AUS cost and the AUS ones (atleast hurricane) are made from thicker material. 1.6mm vs 1.2mm