180 degree headers??

xjpaddler · May 30, 2013

just trying to make sure im understanding this rite.

when building them they go in the fireing order, correct??

greenlion · May 31, 2013

You separate the cylinders that fire after each other on the same bank so that you don't have two exhaust pulses hit the collector at the "same" time. On a SBC/BBC these are 8/4 and 5/7 (firing order 18436572). To do 180 headers you would bring the middle tubes from one side into a collector with the outer tubes from the other side. One collector will have 1/7/4/6 and the other will have 2/8/5/3.

This picture may help:
http://www.speedwaymotors.com/Schoenfeld-Headers-180-1-Small-Block-Chevy-180-Degree-Headers,3517.html

You would use a smaller collector to increase mid-range torque (since the larger collector is no longer need to accommodate the back to back pulses). The longer tubes usually needed to fit these also improves mid range (at the expense of upper rpm power, depending on primary length and max rpm).

TBItoy · May 31, 2013

greenlion said:
You separate the cylinders that fire after each other on the same bank so that you don't have two exhaust pulses hit the collector at the "same" time. On a SBC/BBC these are 8/4 and 5/7 (firing order 18436572). To do 180 headers you would bring the middle tubes from one side into a collector with the outer tubes from the other side. One collector will have 1/7/4/6 and the other will have 2/8/5/3.

This picture may help:
http://www.speedwaymotors.com/Schoenfeld-Headers-180-1-Small-Block-Chevy-180-Degree-Headers,3517.html

You would use a smaller collector to increase mid-range torque (since the larger collector is no longer need to accommodate the back to back pulses). The longer tubes usually needed to fit these also improves mid range (at the expense of upper rpm power, depending on primary length and max rpm).

holy **** that's cheap for headers. Just let the passenger suck some fumes and run those! laughing1

Rockwells607 · May 31, 2013

We just put a set of schoenfields from speed way on a buggy and they look pretty nice for the money

xjpaddler · May 31, 2013

thanks for the info guys, i think were gonna stay with a conventional header. this is a trail rig and not just a hill killer, so keeping the heat further away from the driver would be best!!

zebrajeep · Jun 1, 2013

Aw come on Heath! I love the sound of 180' headers! Go for it!

xjpaddler · Jun 2, 2013

zebrajeep said:
Aw come on Heath! I love the sound of 180' headers! Go for it!

maybe on my next one doc. i need to get some ideas from your rig sometime.

Lauderdale · Jun 5, 2013

Is there anywhere that sells 180 Degree headers for an LS block or are they only custom build?

Nuts · Jun 6, 2013

Lauderdale said:
Is there anywhere that sells 180 Degree headers for an LS block or are they only custom build?

Pretty sure schoenfeld does, but they aren't listed on the website. http://www.schoenfeldheaders.com/index.htm

Lauderdale · Jun 6, 2013

Nuts said:
Pretty sure schoenfeld does, but they aren't listed on the website. http://www.schoenfeldheaders.com/index.htm

Just called them up they said, "No Sir we don't." :wtflol:

Nuts · Jun 6, 2013

Lauderdale said:
Just called them up they said, "No Sir we don't."

:-[ Sorry,either I was lied to or I misunderstood what i was told :dunno:

Either way I have a set of their 180s for a sbc and can't wait to hear them! booyang

85toyo · Jun 6, 2013

http://www.kartek.com/Category/102/Exhaust-Headers-Full-Systems.aspx

These aren't 180 but they may be the best option for an off the shelf LS header.

Lauderdale · Jun 6, 2013

85toyo said:
http://www.kartek.com/Category/102/Exhaust-Headers-Full-Systems.aspx

These aren't 180 but they may be the best option for an off the shelf LS header.

I've looked into crossovers, I'm far from needing exhaust, I may just build some 180's myself. How do crossovers perform and sound?