Re: Exhaust clamps Flat Band
When I replaced my old Black Jack aluminized headers with a new set of Dynatech ceramic coated headers, the collectors were of a completely different design, so I ended up cutting the old Black Jack collectors off the front pipes which were welded on and did a butt joint using a stainless steel flat band clamp. The mechanical joint was fine and there was no audible exhaust leak, but there were signs (carbon/soot) of minor exhaust leaks taking place. I cut a couple of short 1" long stub pipes that fit snugly inside the 2.5" front pipe and collector stub that span the butt joint internally and that eliminated the minimal carbon/soot leaks that were visible.
I wish someone manufactured reasonably priced exhaust flanges that could be welded to the end of pipes as an alternative (my H pipe uses these between each of the front pipes), but the band clamps do work well and allow the pipes to later be separated and removed when necessary, for me that is any time the transmission needs to be removed and replaced.
69 Camaro Z/28 RS, original Azure Turquoise, M21 & 3.73 12-bolt posi. NOM 406ci, AFR 210 heads, Straub hyd. roller cam & Dynatech 1-3/4" > 1-7/8" headers, QuickFuel 750 Annular. Photos at:
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