Side pipe collector / components source for fabricating sidepipe headers

Castle Works · Feb 5, 2017

Hi,

I am looking for a resource that carries 4 to 1 side pipe collectors preferably 1.875" primaries to a 4" collector.

Thanks

Grumpy · Feb 5, 2017

http://www.jegs.com/i/Vibrant+Perfo...Bw-8Bv5xLbKaMaaiRRgsCzPuBZv-2E2aUwaAlu_8P8HAQ

https://gbemandrel.com/shop-for-your-parts?olsPage=products

Even if your 100% correct that the on-line calculators only provide a basic place to start on the header design, and are not going to provide exact data, the basic well dyno proven fact is that almost all the commercial headers were and are designed with fit and ease of fabrication as the primary design parameters and max performance far down the list.
low cost and ease of manufacture , and designing a single header too fit as many applications as possible to simplify inventory issues, has almost always been the manufacturers goal.
longer primary tube length has frequently proven too provide both more mid rpm torque and more average torque, and its the torque within 2000-rpm-to -3000 -rpm of the peak torque that moves the car during almost all the time in performance use.
longer tubes cost more money and make the header harder to design too fit well, so most manufactures rather design a shorter header design that may fit several similar cars rather than the ideal longer header for a single application.

4 into two, into one collector designs (LIKE BELOW)have also proven to be excellent performers,
but the generally work best if the cam timing and high compression are well matched

1110em-02-z+xtreme-team-9-ltr-racing-engines+.JPG.jpg

one of the rather well established racer tricks has always been to run open collectors too reduce back pressure, as
( headers scavenge best, with zero back pressure)
and in many cases, where clearances allowed, we cut the collectors of commercial headers , and welded on pre made extensions
(LIKE THESE BELOW)and almost always saw a boost in performance

https://www.summitracing.com/parts/FLO-C134218234/

one reason side exhaust on corvettes were and are used is the design allowed decent ground clearance AND long efficient header primary tube header designs.

dawsonc · Feb 6, 2017

I've seen some on ebay also that are pretty cheap though I have idea about their quality.

Strictly Attitude · Feb 6, 2017

The ones grumpy posted super high quality the flow design and welds are why they cost what they do. But a decent entry level mig or even flux core could make some.

Side pipe collector / components source for fabricating sidepipe headers

Castle Works

New Member

Grumpy

The Grumpy Grease Monkey mechanical engineer.

dawsonc

Member

Strictly Attitude

solid fixture here in the forum