Basic header tech questions

[Bowtieracing]

Originally Posted by speedjohnston

To determine header sizing you may want to post horsepower level and rpm range to help.

Wow! If you can give me any calcultations that would be great


I am going to use stock GM crate LS7. Engine is 7.0L and GM claims
505 hp and 470 lb.-ft I believe this is stock curve:

http://corvetteactioncenter.com/gall...08ls7curve.jpg

[speedjohnston]

I keep some info on hand that may help...

http://www.popularhotrodding.com/eng...exh/index.html

http://www.centuryperformance.com/ex...h-spg-137.html

http://www.chevyhiperformance.com/te...ech/index.html

if you read all that you'll still be confused. lol

[ironworks]

I believe the ATS step headers for the LS7 were known for making the most power. If memory serves me, they step to 2" not to long after the 1.875 tubing.

Rodger

[Bowtieracing]

Originally Posted by ironworks

I believe the ATS step headers for the LS7 were known for making the most power. If memory serves me, they step to 2" not to long after the 1.875 tubing.

Rodger

Thanks Rodger,

I have no plans to make this any harder than it is. I am looking for as easy as possible way. Since Kooks are known at they make resonable power i plan to make same lenght primarys. I am mostly intrested is there any gain to go with merge collectors? SPD has some nice ones with right flanges.

[Bowtieracing]

Originally Posted by speedjohnston

I keep some info on hand that may help...

http://www.popularhotrodding.com/eng...exh/index.html

http://www.centuryperformance.com/ex...h-spg-137.html

http://www.chevyhiperformance.com/te...ech/index.html

if you read all that you'll still be confused. lol

How right you are.. But now i know how to measure primary size

[speedjohnston]

A buddy of mine has a 2001 zo6, but a built LS2 with a vortech supercharger making over 800hp to the rear wheels and uses a set of 1 7/8 from these guys http://www.americanracingheaders.com/homepage.htm

[ProdigyCustoms]

I have a set of steel ATS Step headers on the way to me I will be test fitting on a AME and a DSE frame. I think they may be the last set ever made.

In steel they are a lot cheaper then stainless, and will look killer coated.

Rodger is correct, nothing will make the power like a step header.

These are for sale, $2100

Joni, if you go to SPD, get your checkbook out! You will spend $1500 on materials in a blink.

[ironworks]

Originally Posted by ProdigyCustoms

Joni, if you go to SPD, get your checkbook out! You will spend $1500 on materials in a blink.

Yeah but the first time you build headers with their U bends you will be glad. Ask anybody who has built a set and is concerned with quality. Not all mandrel benders are created the same. SPD is cheaper then Burns or Wolfe aircraft.

CNC flanges over water or flame cut flanges are pretty nice. If you ever TIG weld a set of SPD flanges you will think your Tig welding just got 10 times better, because the materials are that good.

Rodger

[ProdigyCustoms]

Originally Posted by ironworks

Yeah but the first time you build headers with their U bends you will be glad. Ask anybody who has built a set and is concerned with quality. Not all mandrel benders are created the same. SPD is cheaper then Burns or Wolfe aircraft.

CNC flanges over water or flame cut flanges are pretty nice. If you ever TIG weld a set of SPD flanges you will think your Tig welding just got 10 times better, because the materials are that good.

Rodger

Oh I agree 100%, do it in the shop, just many have no clue what materials can cost. If I remember the materials for motiV8trs headers approched $1800.

[Bowtieracing]

Originally Posted by ProdigyCustoms

...Joni, if you go to SPD, get your checkbook out! You will spend $1500 on materials in a blink.

Since stepped ones are too much science for me. I just try to make the long tubes with SPD flanges and merge collectors if theres any idea for those.

One of my friends here has good bender wich can make mandrel bends easily. Straight pipe isnt that much in stainless here.

I would go in a minute for lemons but they are too much for me in stainless. Dan Lemons gave me good offer, but for now.Its just too much.

The remaining question is ; Do i spent the extra money on merge collectors or not ?