Author Topic: Sbo Thornton shorties  (Read 871 times)

sreta

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Sbo Thornton shorties
« on: February 28, 2018, 01:15:50 PM »
I found these headers on ebay, they seem like a good product. What do you guys think ?
« Last Edit: February 28, 2018, 03:25:16 PM by sreta »

sreta

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Re: Thornton shorties
« Reply #1 on: February 28, 2018, 02:05:44 PM »
I saw them yesterday, and now I can't post a picture or link cause they all have been removed.
« Last Edit: February 28, 2018, 02:08:38 PM by sreta »

sreta

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Re: Thornton shorties
« Reply #2 on: February 28, 2018, 02:58:12 PM »












Found em with google, but they are definitely gone. Weird.
Item description:

$299 INTRODUCTORY PRICE

These headers are designed to replace stock exhaust manifolds with no modifications needed. The starter clearance is the same as the stock exhaust manifolds.

These headers are made to replace stock exhaust manifolds and will still accept factory style exhaust systems with dual exhaust.

The primary tubes are 1 5/8” and the exit flange is best suited to fit 2 1/4” head pipes but will accept 2 1/2” head pipes.

The primary tubes are polished stainless and flanges are chrome plated steel.

Gaskets and header bolts are included



Feel free to ask questions.

Satisfaction guaranteed, returns accepted on unused, unaltered parts

Thornton Muscle Cars, Quakertown PA
« Last Edit: February 28, 2018, 03:24:19 PM by sreta »

Aus78Formula

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Re: Sbo Thornton shorties
« Reply #3 on: February 28, 2018, 03:44:39 PM »
Interesting, wonder where made. There were a few outlet positions and angles so obviously not a direct swap, in most cases there wasn't a second exhaust to meet up with!


Re: Sbo Thornton shorties
« Reply #4 on: March 02, 2018, 09:13:36 AM »

olds403

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Re: Sbo Thornton shorties
« Reply #5 on: March 02, 2018, 09:02:08 PM »
We bought them all. ????

Aus78Formula

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Re: Sbo Thornton shorties
« Reply #6 on: March 03, 2018, 01:55:13 AM »
There's tons listed now, just under different model and engine types for whoever is searching.

olds403

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Re: Sbo Thornton shorties
« Reply #7 on: March 03, 2018, 09:09:53 AM »
Will let you know how these fit

Aus78Formula

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Re: Sbo Thornton shorties
« Reply #8 on: March 03, 2018, 09:40:41 PM »
You grabbed a set, Mike?
I messaged the seller at Thornton's, very brief reply but yes, the exit points are same as their cast manifolds so will swap directly onto car already using those, plus possibly some of the factory version that match with twin pipes, and no they haven't done any power comparisons.

olds403

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Re: Sbo Thornton shorties
« Reply #9 on: March 03, 2018, 10:31:34 PM »
Yes, we are building two Trans Am’s right now.  This set is going on my brothers motor.  It’s a short block we built in the 90’s with trw forged pistons and an engle mondello 230/236 cam.  Heads are #6 race ported with a holley dominator intake.  Going to send the heads out soon for new guides and valve job.  This motor Never been fired.  I think he is ready to pull his car out of hiding.  It’s hotter than mine.  This 403 will break stuff. 

I just built him a full billet 200r4 with a dave husek covertor. 

He is a ways off from putting the motor in the car....


via3d

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Re: Sbo Thornton shorties
« Reply #10 on: March 04, 2018, 11:50:50 PM »
So which headers would be better in your opinion? 

The Thorton 359 JR manifold or these short tubes now offered?

A. I guess the big question is what the port sizes are in comparison to the 1-5/8" tubes.... 
B. Outlets or both 2-1/4 so the choke point size is the same
C. But will one flow better versuse the other?
D. I imagine the short header tubes will have more a a throaty rumble sound (material acoustics?), and the 350 JR manifold will be more quiet.... complete guessing here.
E. Cost essentially the same.
F. Looks - personally I like the tubes better...

 



« Last Edit: March 05, 2018, 12:10:31 AM by via3d »
Jason

Aus78Formula

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Re: Sbo Thornton shorties
« Reply #11 on: March 05, 2018, 12:43:52 AM »
The collector flow isn't as smooth as a nice set of long tube headers that are also tuned for even firing flow. Naturally these are a compromise but should flow better than the cast iron logs, which were only slightly better flowing than stock but removed the cross-over port.

Full length headers weren't a realistic option for me without lots of expense and lots of reworking due to RHD conversion, plus I liked that it looked stock under the hood but had double the power lurking. Heat under the floor is also a big problem with these cars so one way to limit that.

The new shorties are interesting though, potential to swap over or back with minimal work, although I'd be getting them coated to remove the bling effect. It depends what the stainless type is, some turn brown anyway. A mounting face pic would also be of interest as there's a fair mismatch in port shape, same as many Olds headers though. Hopefully soon, someone will have some first hand results.

Edit: Actually, there's further photos in ad that show slightly tapered ports from rectangular to round, that's better than what I thought might be there. Also, the dipstick is made to go over them. like other headers, not under like the manifolds. That can create problems during swaps, have to be extra careful not to pull it  too far to make fit. The primaries from the heads are 2.25" as per ad.
« Last Edit: March 05, 2018, 12:54:41 AM by Aus78Formula »

olds403

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Re: Sbo Thornton shorties
« Reply #12 on: March 05, 2018, 08:56:56 PM »
Once we get them and get our motor back I will post pics.  Putting them on my car is a about 1/2 days work and gaskets. that is not in the plan.

Dr87

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Re: Sbo Thornton shorties
« Reply #13 on: May 06, 2018, 04:01:21 PM »
I put them on mine

mikebooms

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Re: Sbo Thornton shorties
« Reply #14 on: May 07, 2018, 11:16:59 AM »
I put them on mine

what did you have on the car before? how was the install?

Re: Sbo Thornton shorties
« Reply #14 on: May 07, 2018, 11:16:59 AM »

Dr87

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Re: Sbo Thornton shorties
« Reply #15 on: May 07, 2018, 02:12:10 PM »
I had manifolds on it. I had to jack the engine up to get them in. They fit ok but not like factory manifolds. I had to get a custom down pipe on the pass side and on the drivers side the header flange hits my z bar

via3d

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Re: Sbo Thornton shorties
« Reply #16 on: May 08, 2018, 06:19:58 PM »
Headers rub, really?
Jason

Re: Sbo Thornton shorties
« Reply #16 on: May 08, 2018, 06:19:58 PM »
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