- Messages
- 1,117
- Reactions
- 597
I bought a 1970 Blazer with a 350 a while back, the exhaust has a crossover pipe leading into the single muffler and the pinch seam of that muffler was blown out. The blown muffler has a 2 1/2" input and a 2" output and tailpipe, from the parts catalogs it appears to be the original size. That tailpipe isn't mandrel bent either. Last week I installed a muffler that I had laying around, same overall size, 2 1/2" in, 2 1/4" out. I had to run into town so I drove it installed but not yet welded and it sounded great at first, after ten miles the walls of the muffler began vibrating VERY loudly at idle.:huh: I got the welding stuff, drove home and welded it on. Too bad I welded it all the way around because it's still VERY loud at idle, enough to startle the neighbors horse. It's fine above about 1500 rpm. It's not leaking, the muffler walls are vibrating, I can quiet it down by squeezing the muffler.
Too much back pressure? Should I hack that 2" tailpipe off with it's restrictive bends? I almost went out today to drill a hole into the muffler to balance the pressure.
Too much back pressure? Should I hack that 2" tailpipe off with it's restrictive bends? I almost went out today to drill a hole into the muffler to balance the pressure.