The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 67-72 BigBlock 4x4s! Pos pics info here.

Gobuffalo · 07-25-2014, 04:16 PM

I used a Flowmaster 3", 409 stainless builders kit and Magnaflow 3", 409 stainless mufflers. The Flowmaster kit is about $350.00 from Summit. The hardest part was the flanges to bolt the exhaust to the headers. I could not find anything made of 409 stainless. I ended up using 3/8" steel flanges. You have to use a special welding rod called 309L to weld mild steel to 409 stainless.
I could not find any premade systems made of anything bigger than 2" for a 4x4. Lots of stuff for 2 wheel drive. The kit had almost enough parts for the complete system. I had to buy 1 extra 45* bend to finish the tail pipes.

07-25-2014, 04:16 PM	#115
Gobuffalo Registered User Join Date: Mar 2012 Location: Crestline, CA Posts: 225	Re: 67-72 BigBlock 4x4s! Pos pics info here. I used a Flowmaster 3", 409 stainless builders kit and Magnaflow 3", 409 stainless mufflers. The Flowmaster kit is about $350.00 from Summit. The hardest part was the flanges to bolt the exhaust to the headers. I could not find anything made of 409 stainless. I ended up using 3/8" steel flanges. You have to use a special welding rod called 309L to weld mild steel to 409 stainless. I could not find any premade systems made of anything bigger than 2" for a 4x4. Lots of stuff for 2 wheel drive. The kit had almost enough parts for the complete system. I had to buy 1 extra 45* bend to finish the tail pipes.