Thorley's
Thread Starter
Launching!
Joined: Dec 2005
Posts: 225
Likes: 0
From: Ontario
Thorley's Folks,
What's the best way to connect the thorley's to a DP?
I see threads with people welding on a flange - I'm concerned about welding to the thorley DP as it will start rusting regardless of ceramic coating.
Thoughts?
What's the best way to connect the thorley's to a DP?
I see threads with people welding on a flange - I'm concerned about welding to the thorley DP as it will start rusting regardless of ceramic coating.
Thoughts?
the thorley's rust just like any other mild steel, they are a joke when it comes to their claims of never rusting. I have never had an OBX header rust to this day, and mine still havent even after a harsh winter. Go with whatever you think will seal best, i tried a vband, wasnt happy with it, went with the hedman ball flanges instead which you have seen already.
Thread Starter
Launching!
Joined: Dec 2005
Posts: 225
Likes: 0
From: Ontario
10-4; I'll keep that in mind.
So there's no point in re-coating if I do weld a flange on?
I'll be happy so long as I don't have any holes to patch in a few years.
My OBX actually had welds break on them (this was on my 3100 Malibu, the headers didn't even clear the heads, had to have one runner re-shaped); I had a previous horrible experience with them, mind you people have had better luck with them on the ls4 by the looks of it.
So there's no point in re-coating if I do weld a flange on?
I'll be happy so long as I don't have any holes to patch in a few years.
My OBX actually had welds break on them (this was on my 3100 Malibu, the headers didn't even clear the heads, had to have one runner re-shaped); I had a previous horrible experience with them, mind you people have had better luck with them on the ls4 by the looks of it.
welds breaking apparently is a common thing on any made in china headers, ive seen it happen on all kinds of brands not just OBX, doug thorley though, and JBA, sadly ive seen rust horrifically. My buddy put a set of doug thorleys on his truck a couple years back and they were developing rust a month afterwards, after a year they looked like the exhaust manifolds that came off.
Thread Starter
Launching!
Joined: Dec 2005
Posts: 225
Likes: 0
From: Ontario
Now that sucks - you pay good $$ you at least expect them to last; I've thought about trying fireball coatings here where I live - they've got a really good rep and will coat a set of headers for $225 Canadian inside and out..
Mine have not rusted at all to this day 4 years later. I have a flex welded on the end of the dp and the rest all aluminized steel, I always use exhaust paint though frome dp back on my exhaust so I never have that issue. All welds fresh out the shop or if I do them at the garage get painted immediately
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Originally Posted by 91parkave
Mine have not rusted at all to this day 4 years later. I have a flex welded on the end of the dp and the rest all aluminized steel, I always use exhaust paint though frome dp back on my exhaust so I never have that issue. All welds fresh out the shop or if I do them at the garage get painted immediately
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Thread Starter
Launching!
Joined: Dec 2005
Posts: 225
Likes: 0
From: Ontario
Sweet jesus that's horrible...
Alright; I'll make sure the welds are painted and get a good flex welded onto it.
What are some good header bolts to use? I assume steel multi-layer OEM gaskets are the best bet?
Thanks!
Mike
Alright; I'll make sure the welds are painted and get a good flex welded onto it.
What are some good header bolts to use? I assume steel multi-layer OEM gaskets are the best bet?
Thanks!
Mike
Teching In
Joined: Sep 2015
Posts: 46
Likes: 0
From: Ontario, Canada
I don't know the part no, but I would say use some ARP 12 point header bolts. They're pretty nice. Otherwise new stock bolts should work I believe.
The stock metal GM gaskets should work. Rock Auto has a good price on them.
The stock metal GM gaskets should work. Rock Auto has a good price on them.
stock metal GM gaskets work fine, never had an issue with them on mine even though i did wind up going to felpros afterwards in a search for an exhaust leak. Those dont leak either. I had alot of bolts from mcmaster car in varous lengths so I used grade 10.9 hardened steel bolts. You just have to account for the flange thickness change over stock to make sure you have the appropriate length thread, i wound up with a slightly longer threaded bolt because the OBX flange was thicker then stock.
You can see here i was able to change mine out with a u bolt and get it tight but it relies on a pressure seal rather then a physical seal. Look at that clearance, ugh.
