Band Clamps

I bought some band clamps shown below from Dynomax to attach to my Spitfire headers. The space in the early a-bodies is very tight and I want to maintain the 2.5" diameter of the header collector tube. I can at least clock the clamp in any direction I need to clear the Z-bar and such.. My muffler guy could weld on the typical headers flanges but getting 2.5" pipe in there is tough with the Z-bar and all. He can use U-bends to snake it in there but I was thinking of using these band clamps like they use on the semi trucks and turbos.



Or these but they are more expensive and require welding.



I think it should work well for my setup but was wondering if anybody ever tried using these before? And if so, what tricks did you use to keep them from leaking.....silicone, etc?

Dave
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