Re: s475 mounting
I mean if you have a free bolt hole on the block, I'm sure that would work just as well. The headers alone could potentially support it but I wouldn't want to put my exhaust hardware through that stress, let alone the nerves every time you hit a big bump. You can static mount it, but like you said, you'd need flex joints on the piping then to avoid fatigue cracking.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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