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If your ride still sounds like a tin can at speed, it’s time to get serious. Dynamat Xtreme isn’t a luxury add-on — it’s a foundational upgrade for builders who want their cars to feel tight, solid, and finished. This is the same material trusted in high-end customs, competition cars, and OE applications for one simple reason: it works.

THE REAL COOL CAT
There was a time in this country when automotive platform sharing wasn’t as blatantly obvious as it is today. Cars that shared platforms didn’t necessarily also share 90 percent of their parts and styling; for example, the difference between Fords and Mercurys was more than skin deep. So, when Mercury decided it wanted to produce its own version of Ford’s smash-hit Mustang, the company knew it had to do more than give the car a new grille. The car it created—the Cougar—became an instant classic: it shared its basic underpinnings with the Mustang, but no sheetmetal.
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PRODUCT SPOTLIGHT: Big Block Chevy Round Port Custom Header Build Kit by Stainless Headers MFG. INC.
The Ultimate Custom Header Build Kit for Your Big Block Chevy
Author
The Auto Builder Staff
Photos Courtesy of Stainless Headers MFG. INC.
If you live for pulling trucks, racing, or high-performance applications, this build kit has everything you need to bring your vision to life. It’s designed to fit the standard bore space of big block Chevy heads, making it versatile enough for a variety of builds.
Unparalleled Precision and Quality
What sets this header build kit apart from the rest? It’s all about the details:
- Flanges: The kit includes two American-made, precision laser-cut 3/8″ thick header flanges specifically designed for Big Block Chevy heads. You can also opt for eight single port flanges for easier fabrication and installation.
- Full Bank Port Size Options: Choose from 2″, 2 1/8″, 2 1/4″, 2 3/8″, or 2 1/2″. Single port flange options are available in 2 1/4″, 2 3/8″, or 2 1/2″.
- Mandrel Bends: You get twelve 180-degree J bends with 6″ and 12″ legs. These extra-long legs mean you won’t need to buy additional straight tubing. The bends are crafted from American-made 304 stainless steel, which forms better, welds better, and lasts longer.
- 4 into 1 Collectors: The kit offers precision-formed 4 into 1 collectors or optional super high-flow slip-on merge collectors with four sets of collector tabs. Like the bends, these collectors are made from top-quality American-made 304 stainless steel.
- Collector Stars: These laser-cut stars simplify the fabrication process, acting as a weld-in block between the tubes before attaching the collector.
- Purge Caps: Back purging is a breeze with these caps. Each kit includes four primary caps and one collector cap.
- O2 Bungs: Two precision-machined, weld-on O2 bungs are included. Made from 304 stainless billet, they weld beautifully.
- Tig Filler Rod: The kit includes a half-pound package of filler rod, ensuring you have everything you need for a perfect weld.
Performance You Can Count On
The Pro Series Big Block Chevy Header Build Kit is engineered to handle serious horsepower:
- 2″ Primary Tube Header Kit: 450-600 Naturally Aspirated Horsepower
- 2 1/8″ Primary Tube Header Kit: 600-800 Naturally Aspirated Horsepower
- 2 1/4″ Primary Tube Header Kit: 800-950 Naturally Aspirated Horsepower
- 2 3/8″ Primary Tube Header Kit: 900-1100 Naturally Aspirated Horsepower
- 2 1/2″ Primary Tube Header Kit: 1100+ Naturally Aspirated Horsepower
Stay Connected and Inspired
Head on over to the Stainless Headers Mfg. Inc. community on Facebook, Instagram, and YouTube. Stay updated on customer projects, watch how-to videos, and get the latest information about their extensive product lineup.
So, whether you’re building a beast for the strip or the street, the Pro Series Big Block Chevy Round Port Custom Header Build Kit from Stainless Headers Mfg. Inc. is your go-to choice for unparalleled performance and quality. Get yours today and unleash the full potential of your big block Chevy!



