Author Topic: RARE/ Thornton Olds exhaust manifolds  (Read 20318 times)

Aus78Formula

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RARE/ Thornton Olds exhaust manifolds
« on: April 25, 2010, 08:14:21 PM »
I recently took delivery of a set of these courtesy of Paul at RARE. I also got them ceramic coated in stock cast iron grey. Here's some comparison pics to stock manifolds off a 350/403 as found on Firebird and others.



The P-side exhaust crossover has been removed to form true-dual exhausts, the outlet is angled to match most existing manifolds, not this one, but entire system wil be replaced anyway.



The centre ports also now have a divider, even if it only goes so far inside.





Driver side.





The outlet has now been enlarged to 2-1/4" to match both sides.



And for those wanting a bit of bling you can have the polished 'chrome' ceramic as well, not quite what I was after!



Hope this is of interest

« Last Edit: April 25, 2010, 08:16:29 PM by Aus78Formula »

baxter

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #1 on: April 25, 2010, 11:33:47 PM »
Very cool!  Should sound a bit throatier...if that is a word
Old cars never die, they just go faster

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gold79ta

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #2 on: April 29, 2010, 01:02:31 AM »
Those are on my very long "wish"list of things I want

Aus78Formula

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #3 on: November 03, 2010, 06:47:49 PM »
Brief update for anyone interested, the original factory manifold heat cover that wraps around the manifolds will not fit the chunkier Thornton items unless longer studs/spacers are used. The top half of the stove plate with hot air tubing to aircleaner still fits as normal.

Cbled56

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #4 on: December 22, 2010, 10:33:42 AM »
What do you do about the passenger side with the 3 bolt as apposed to only 2 bolt on the Thornton?  Thinking about ordering as my passenger side exhaust has one of the 3 bolts snapped off.
1966 GTO Vert
1969 GTO
2006 GTO
1972 Formula 455HO
1976 LE Trans Am 
1976 Formula 350
1977 Grand Prix
1978 Trans Am
1979 Trans Am
1968 OLDS 442
1971 TR6

Re: RARE/ Thornton Olds exhaust manifolds
« Reply #4 on: December 22, 2010, 10:33:42 AM »

Aus78Formula

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #5 on: December 22, 2010, 04:55:24 PM »
That's fairly common, one of mine was redrilled through the broken stud and a new stud threaded into it. You will need to modify the end of your pipe anyway due to the different angle and have it flared, the matching flange is included. If you already have a dual exhaust fitted with capped off crossover from stock manifolds then thats all that's required, plus the D-side is now the same size so will not need a reducer, again the flange is included so shouldnt be an issue.

Cbled56

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #6 on: December 29, 2010, 08:15:39 AM »
I received mine in the mail the other day but only the manifolds came, did not receive any flanges.  Are they suppose to come with them.
Thanks.
1966 GTO Vert
1969 GTO
2006 GTO
1972 Formula 455HO
1976 LE Trans Am 
1976 Formula 350
1977 Grand Prix
1978 Trans Am
1979 Trans Am
1968 OLDS 442
1971 TR6

Aus78Formula

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #7 on: December 29, 2010, 08:18:47 AM »
Extra from memory, got mine from RARE. Might be something the typical exhaust place has but I figured since they had them I'd grab them also.

Cbled56

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #8 on: December 29, 2010, 08:54:37 AM »
Thanks for the quick reply.  I will call Troy at RARE today and have him send me some.  How did you set up the rest of your exhaust system.  Did you use an X pipe.  Was thinking of using Pypes system but didn't see anything with 2 1/4 everything was at least 2.5 to 3.  Do you have any Pics by chance of your set up.
Thanks.
1966 GTO Vert
1969 GTO
2006 GTO
1972 Formula 455HO
1976 LE Trans Am 
1976 Formula 350
1977 Grand Prix
1978 Trans Am
1979 Trans Am
1968 OLDS 442
1971 TR6

Aus78Formula

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #9 on: December 29, 2010, 08:59:22 AM »
Mine are still in boxes actually, nothing has been done to the car such is the slow rate of work on the engine. It's easier for them to keep churning out Ford and Chev engines than an Oldsmobile, need to give them yet another boot up the rear after the break.

Mine will be custom system though, 2.5" throughout with X-pipe, dual mufflers and 2.5" Pypes splitters.

Car Guy

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #10 on: January 24, 2011, 11:38:40 AM »
So what is the performance gain with these?   

Updated71

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #11 on: January 26, 2011, 08:14:04 AM »
So what is the performance gain with these?   

I'm interested in this as well.
The surgeon general never said nuthin' 'bout smokin' the competition!

TA MINT79

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #12 on: January 26, 2011, 10:11:37 AM »
Those are nice. I really need to get a set of those for my '79. I want to run a dual exhaust without headers and these would work great for me.
-1979 Trans Am 6.6 Litre in Platinum with 32K Original Miles

Updated71

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #13 on: January 26, 2011, 12:29:57 PM »
BTW, how about a link or some other contact info?
The surgeon general never said nuthin' 'bout smokin' the competition!


Re: RARE/ Thornton Olds exhaust manifolds
« Reply #14 on: January 26, 2011, 03:42:17 PM »



Updated71

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #15 on: May 03, 2011, 03:00:38 PM »
These things have been backordered for so long, I'm about to give up.  Is anyone else waiting on a set or is it just me?
The surgeon general never said nuthin' 'bout smokin' the competition!

Aussie 1977 Trans am

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #16 on: May 12, 2011, 04:22:55 AM »
So Aus how much are they? And do you have a 350 or 403?
I have a 350 Olds and just wondering where you get parts (ie gasgets) they don't seem popular here?
Thx
Regards Edward
Melbourne, Australia
1977 Trans am TA  Olds 350 Th350 A/C Snow Flakes 15 x 7 8 track, Fisher T-Tops

Aus78Formula

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #17 on: May 12, 2011, 04:50:09 AM »
Ed,

RARE has them listed at $295/pair. From memory you can also get matching gaskets, collector plates and bolts for another $15 or so. When I got mine they had a special deal on the ceramic coating so went that way as well. Says special deal still available but I think it was closer to $100 or 120 when I went through it a year back. And shipping wasn't too bad for such a large box and heavy items, about $100 to Sydney? (I got them shipped directly, would have been perhaps half that if using a freight shipping company and wait several weeks)

Either way it ended up cheaper for a set of coated manifolds than a set on headers that you have to modify to fit, still rust out and give fitting and heat dramas. Yet to see anyone actually test them compared to stock manifolds or other, magazines ignore Olds.

http://www.ramairrestoration.com/catalog/product_info.php?cPath=34_38&products_id=365

For any urgent service parts I have used Dave from Pontiworld, usually has the basics in stock. But some of the less common items can come at a price so compare prices even with shipping from o/s added. I have often used that as a guide on what things cost locally and occasionally been surprised. Picked up complete A6 A/C compressor and new clutch fitted and accessories at a fraction of the price they were selling for in the US, made the idea of reco'ing my original a joke.

https://pontiworld.com.au/usgmsp/

I found these guys good too for o/s orders, usually respond fast to emails about parts and details etc. Mainly repro restoration parts than original service parts though.

http://www.firebirdcentral.com/


There's also the bigger guys like Summit and Ames, used once or twice with no dramas. Summit are another with huge inventory on engine parts so can be good for comparing prices.

Mine's the 403, externally you wouldn't know the difference from yours other than casting number. What gaskets were you after, there's a few tricks and good vs bad that are realised after a few orders! PM me if you want!
« Last Edit: May 12, 2011, 04:54:11 AM by Aus78Formula »

NomadicTa

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #18 on: June 16, 2011, 06:35:44 PM »
Hi i bought these same manifolds in hopes of keeping my car on the stock side, and now am unable to find downpipes to fit, pypes told me they are not manufactured ? plz help

Aus78Formula

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #19 on: June 16, 2011, 07:04:52 PM »
The downpipes will need to be made up at an exhaust place, fairly straight forward.

Updated71

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Re: RARE/ Thornton Olds exhaust manifolds
« Reply #20 on: June 17, 2011, 05:15:22 AM »
I just put these on yesterday and came back from the exhaust shop.  The sound is great compared to the headers that were on the car before.  I was suprised it didn't get much quieter.  Seat of the pants doesn't see much of a difference.  It's almost as if it has more power now.  I wish I would have went this way from the beginning and not bothered with the crappy headers that are offered for our cars.
The surgeon general never said nuthin' 'bout smokin' the competition!

Re: RARE/ Thornton Olds exhaust manifolds
« Reply #20 on: June 17, 2011, 05:15:22 AM »
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