2020-B1-9

Author Topic: Sbo Thornton shorties  (Read 5461 times)

olds403

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Re: Sbo Thornton shorties
« Reply #40 on: March 03, 2019, 09:17:08 AM »
We have a set, but my brother has not put his motor in his car yet.  We have only used the thorton w/z small block manifolds.  Hands down those really clean up the under belly.  As for performance, doubt any difference although installing full lenght headers in the trans am with olds motor sucks....

lugnuts

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Re: Sbo Thornton shorties
« Reply #41 on: July 30, 2019, 06:16:21 PM »
So I am getting ready to install my motor and started installing the Thornton shorty headers and I will say these need to be installed on the motor OUT of the car. there is no way you will get the driver side on if the engine is in the car. the second bolt from the rear is almost impossible to get in and if the engine is in the car you wont get it in. I'm not even sure how I would ever get that bolt out after its been on the engine for a while. its just so tight its hard to get a wrench on the bolt so once it is rusty and has a bunch of heat cycles the only way I see of getting it off is to cut a section of tube off and then you can get a ratchet on it.
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" daddy my hat blew off, I hope your darn head was in it"

olds403

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Re: Sbo Thornton shorties
« Reply #42 on: July 31, 2019, 08:56:33 PM »
Probably not worse then a set of headers.  I ran Hooker Super Comps in the 80's on mine

lugnuts

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Re: Sbo Thornton shorties
« Reply #43 on: August 02, 2019, 11:29:38 PM »
Probably not worse then a set of headers.  I ran Hooker Super Comps in the 80's on mine

they are worse. the second bolt from the back is completely blocked by the tubes. you can just get a wrench in there and the movement is minimal. I don't see being able to remove these after they've been on there for a period of time. to access that bolt with a socket would requre removing a section of two pipes.

I will say they do look nice and other than the one bolt the clearance is decent.
Check out the progress of my restoration on my YouTube Channel. Click here: TheOriginalLugnuts (Updated Weekly)
  
" daddy my hat blew off, I hope your darn head was in it"

Nexus

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Re: Sbo Thornton shorties
« Reply #44 on: August 03, 2019, 06:30:08 AM »
Following with much interest!!

Anyone throw a set on a 301?

Should I even bother, other than it looks cooler when you open the hood!!

I'm not looking to race anyone or break land speed records, I just want to have fun once in awhile
Charlie

79 Esprit but like many, it will be a T/A clone
(19 years and counting but still have her)

sreta

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Re: Sbo Thornton shorties
« Reply #45 on: June 21, 2020, 04:03:11 AM »

Wallington

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Re: Sbo Thornton shorties
« Reply #46 on: June 21, 2020, 06:28:09 AM »
They always claimed to have never run up any figures with the previous cast manifolds and shorties, which is obviously rubbish. But now, improved versions of the unknown! The improved version being thicker flange and clearanced area. So the figures mentioned probably match the version 1 shorties too. Good to see some more options, even though if you already had one set you probably wouldn't upgrade just for the sake of it.
Thanks for the update.
« Last Edit: June 21, 2020, 06:44:16 AM by Wallington »

olds403

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Re: Sbo Thornton shorties
« Reply #47 on: June 23, 2020, 10:29:16 PM »
the listed downpipes listed do not work on a trans am.  The driver side will cause you issues.  Sold mine. 

Wallington

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Re: Sbo Thornton shorties
« Reply #48 on: June 24, 2020, 07:16:12 AM »
So never had a chance to test or see if they direct swap with the manifold version, I guess.

olds403

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Re: Sbo Thornton shorties
« Reply #49 on: June 24, 2020, 08:49:10 PM »
I went with a set of American Racing Headers (ARH).  Nick the owner talked me into them just before the end of last year which are amazing looking in person.  My brother has the shorties now and no chance of him installing them until his new auto shop is operational.   We did install a set of the JR Thortons on the 424 stroker motor and they fit fine and look great.  Wanted a stock look for the 10th Anniversary. he ARH headers I will install once my LS Olds motor is dyno'ed.  No rush on that since my brothers shop is not yet complete.  Any extra time/money is going into the shop.  This is year is cashed out - 2021 maybe.......

Re: Sbo Thornton shorties
« Reply #49 on: June 24, 2020, 08:49:10 PM »
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