Exhaust mainfold and downpipe connection

[Koffer]

Dave
I believe it has a "doughnut" style , but if your fighting the rust monster you may want to look into taking it to a local independent exhaust shop and have them replace the studs and fix it (theres a couple of good shops in Hamilton ) or if your not using it as a DD you might want to look into doing historic QQ plates so you don't have to deal with the "fun" called the NJMVC inspection stations anymore

Originally Posted by dzwestwindsor

Hello,

I have a 71 chevy c20 with a 350

According to the inspection station, I have an exhaust leak. It's pretty obvious because the downpipe connecting to the exhaust manifold can be pivoted and moved around a little, since the bolts holding it on aren't tight.

This image (found on another thread) shows the connection between manifold and downpipe: http://67-72chevytrucks.com/vboard/a...1&d=1341063890

However, I'm having trouble getting the bolts off- they are essentially fused together because of the rust. So before I spend more time trying to get them to move, I'm wondering if there's a gasket in between the manifold and the downpipe, that i would need to order? I want to order it before hand so I can save some time, but I'm not sure if a gasket even goes in between there?

Thanks

-David

[cdowns]

i always used a torch getting the area cherry red and they clamp on to them with visegrips to get them out// about a 75% success rate and if they snaped i'd just drill and tap for new studs

[bobs409]

Not sure how bad the rust is but if you can get in there, you could split the nuts with a... wait for it.... nut splitter.

[WIDESIDE72]

Originally Posted by Koffer

Dave
...if your not using it as a DD you might want to look into doing historic QQ plates so you don't have to deal with the "fun" called the NJMVC inspection stations anymore

I would highly advise against registering it as antique/ classic/ historic for the purpose of circumventing the safety standards. I have vehicles registerd as antiques but not for this purpose. An exhaust leak could be putting carbon monoxide into the cab creating a deadly situation. In the least the exhaust leak sounds really bad.
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[Koffer]

I would say this too before NJ changed the inspection to just ODBII on 96 and newer and idle test on 95 and older emissions test .
Theres no safety testing what so ever , so no brakes, bald tires , no mirrors a head sized hole in the windshield or no lights of any kind working your good to go as long as it passes emissions.

Most of us here on the list take way better care of our trucks then 95% of the people on the road , I was trying to help Dave from dealing with the numb nuts at NJ MVC (most likely I same one I use ) who tried one time to "sniffer test" my diesel and also dropped my wife's truck off the front end rack and caused $1000 of damage back when they checked the front end.

The other reason I said to Historic plate it is to keep NJ from taking even more money from Reg fees every year as the Historic plates are paid only once then no more reg fees

Originally Posted by WIDESIDE72

I would highly advise against registering it as antique/ classic/ historic for the purpose of circumventing the safety standards. I have vehicles registerd as antiques but not for this purpose. An exhaust leak could be putting carbon monoxide into the cab creating a deadly situation. In the least the exhaust leak sounds really bad.
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