What year Honda? How many miles on it?

Just want to double check: Have you tried soaking the threads as best you
can in PB Blaster for a few times a day, then overnight, or similar, then
tried breaking them free?

PB Blaster is remarkable stuff. It freed some nasty exhaust bolts/nuts on
which I was working a couple of years ago, though it still took some serious
leverage.

I think the exhaust bolts are second only to certain suspension bolts in
seizing over time. The suspension bolts are prone to break before they free.
People seem to have much more luck with exhaust bolts.

"Steve" <junk@therivets.net> wrote
> The front of the cat has a flexable connections with bolts and springs. No
> problem here. The back end of the cat has three threaded studs/bolts
> coming out of the flange. I'm hoping to reuse the cat but I cannot get
> these three bolts out of the cat.. I had to cut the rusted nuts off to
> disassemble and I need to be able to bolt this end of the cat onto the new
> pipe I'm replacing. Looks like I'm going to have to grind the flange flush
> on both sides and drill the holes out to accept three new bolts????
>
> I've never seen perminant bolts like this?? I've seen a fixed nut on one
> flange but not the bolt.????
>
> When I look up new Catalytic converters it looks like there are holes
> there not threaded studs???
>
> Could these bolts be badlt rusted in place? I wacked it pretty hard and
> have just about cut one of the "heads" off (they look like a "t" head not
> a nut shape) and the shaft of the bolt wont budge... Like its part of the
> flange..
>
>
> Is this unusual????
>
>
> Thanks
>
> Steve
>