This may be an extremely noobish statement.. but I thought the LS3 has 426hp stock?

Just found my answer in another thread... disregard the noobish question.

are the Doug Thorley shorty headers for the SS 1 7/8"?

:facepalm: At the crank yes....

As stated before, those are STD numbers.. the industry standard, so to speak, on a dyno jet are SAE numbers, which would put your somewhere in the mid 38x hp range... which seems about on par. Maybe a little bit high actually. Again... next time, I would ask for SAE numbers, as it sets a level playing field, because it compensates for pressure, humidity, air temp, etc. It gives you a better idea on comparing it to other dynos. Going to a dyno jet dyno and getting STD numbers is just someone looking for high dyno queen numbers. If you want to use the dyno as a tool, as it's intended to be, and not a measuring device, go with SAE. If you just wanna show off, get STD.

should you choose to get headers, please... do not get 1 3/4. as stated before... a 1 3/4 header does not belong anywhere near one of these motors, performance wise. Unless you have a very picky state on inspections/emission, longtube 1 7/8 all the way (catted or not catted, up to you). Even if my car was just a bolt on car, I would still not even think about putting a 1 3/4 primary header on it.

Another Dr. Wrench bites the dust......:laugh:

Nice numbers man i would be proud hell i might just put that dyno paper on my fridge.

are the Doug Thorley shorty headers for the SS 1 7/8"?

I believe thorley headers are only offered in 1 3/4 but 1 7/8 may be forthcoming

hmm, yeah it's crazy that nowhere on the website or in my shipping information does it say what diameter they are, or anywhere on the internet that I could find for that matter.

Wow...those numbers are spectacular for a near stock rig! Congrats.

:facepalm:
Have you not seen the Doug Thorley 1 3/4" vs Brand X 1 7/8" dyno chart that was done by an independant (RPM Inc.) shop??

Yes...still a ways off though.

1 3/4" Sir! :thumbsup:


As far as headers go..1 3/4" Doug Thorleys.....all day long sir! No need to go to a 1 7/8" unless you are planning on perhaps a S/C setup or something like that later.

PM me and I would be happy to help or answer some more questions for you and again, nice numbers!
-Ivan :thumbsup:

Hey SpiffyGuitar here's some good info for you man, and the link is here it's a good read
http://www.camaro5.com/forums/showthread.php?t=73140

If you're planning on a cam in the future...

Post#53

We do not believe that 1 7/8" headers are necessary on a camshaft car. When you go to forced induction is when we move up to the 17/8".

We have run the LG 1 3/4" headers on LS7 Z06's with zero loss of HP. A change to 1 7/8 netted 0 HP & a 5 Lb/Tq loss on the same engine.

We just installed our Stage 2 camshaft in 2 different LS3 Camaros one with 1 7/8" headers and one with 2" headers. Both had the exact same header systems with cats. The 2" was down 15 lb/tq with no gain in power.
__________________
Vector Motorsports
http://WWW.VectorMotorsports.com
586-790-2970

Thanks for the info!! :thumbup:

I'm very interested in trying out the Doug Thorley shorty headers! I was looking at getting long tubes, but I like the idea of being able to bolt up shorties myself without having to get it welded... and the price seems right!