H3 HUMMER L52 engine 5-1 exhaust manifold fabrication timelapse| Rusty collector into a trick header

In order to rebuild an old, rusty motor, you need to go through every single component. As a matter of fact, you'd be better off replacing factory parts with aftermarket goodies. On a Hummer H3, replacing the stock cast iron exhaust manifold is a necessity, due to it being prone to cracking. I've made a high-flow replacement manifold with equal length runners using AISI 304 stainless steel. Each runner is 42.4 mm wide, wall thickness is 3 mm, while the 5-1 merge collector is 60 cm long. These specs allow for increasing engine efficiency and improving exhaust gas flow out of the cylinders on this inline-5 L52 Vortec 3500 GM's engine. This exhaust manifold is durable enough to allow for installing a turbocharger. The manifold was made using a TIG-welder fed with argon. This timelapse video shows the entire process of how the exhaust header was made.

🔴For more comprehensive information on the key stages of developing and welding up this manifold, see my series which includes the following videos:
1. Making a jig for welding an exhaust manifold with dimensions identical to stock.
https://youtu.be/VGiX4U52iDE
2. 5-1 merge collector. How to merge equal length runners into one tube.
https://youtu.be/W-aOiKD6h9Q
3. Geometrically mapping out an equal length tube headers.
https://youtu.be/FINZnZtxJpo

🔴If you have any questions, feel free to leave them in the comments.
Whoever is first to answer the following question will receive a cash prize (5$ transferred to bank account or cell phone balance):
- how exactly did I screw up (multiple times) after first test fitting the mock-up manifold to the car?

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