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Ordered thorley's today...

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Old Sep 14, 2006 | 10:19 PM
  #11  
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Originally Posted by BlackGMC
How much did you pay for those???
$567 - 14 gauge, ceramic coated, no shipping or handling charges.
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Old Sep 14, 2006 | 10:20 PM
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Originally Posted by gonzo 6.0
Isnt the Tri-Y designed to benifit due to and engineered for the firing order?Look at these and look at the old SBC tri-Ys the old engine has a different firing order does this Y differnt than the old pipes?
Correct. That's what I meant by saying the primaries were optimized.
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Old Sep 14, 2006 | 10:27 PM
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Originally Posted by Moddoo
Damn those are

J/K

I'm sure they will be a nice addition to the truck.

The truth is, noone has any dyno info at 2000rpm for these different headers.
The only pacesetter dyno with 2000 rpm I've seen is from a LS1 and the torque was exactly the same as stock. Then again, who knows how well these are tuned before and after.
We need a decent comparison and dyno results at low rpm.

I just got my pacesetters from jethot today.
I may dyno it after they are on, but won't be able to get a before dyno to compare.

I can't believe it's taken 7 years to get as little decent header info as we have.
I was going to say the same thing about your cam:

Comp 206/212

Just kidding also.

I hope your Pacesetters don't look like this set:


Thorley has been making headers for decades. I trust he knows his stuff.
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Old Sep 14, 2006 | 10:35 PM
  #14  
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My question is :are these tubes configured in a different order than the SBC,they should be since they have a different firing order.
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Old Sep 14, 2006 | 11:33 PM
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Originally Posted by Moze
I was going to say the same thing about your cam:

Comp 206/212

Just kidding also.

I hope your Pacesetters don't look like this set:


Thorley has been making headers for decades. I trust he knows his stuff.
you wanna fukn race azzhole! my cam is HUGE!

Naw, my pacesetters look better than that.

I'll post a buncha crap when I get them on next week.

Speeking of torque, thats why I got the cam that I did.
Y' aint got much to worry about with that 3000 TC.
I'm cruisin at 1500rpm with these 3.42s!
Did the thorley guys tell you they were strongest at any certain rpm? Matches your cam range?
We should chat more later about these Z71s

I considered the tri Ys, but went for the PS full bolt on setup.
I'll give honest opinions after it's all tuned and ****.


Good luck with those.
Last edited by Moddoo; Sep 14, 2006 at 11:39 PM.
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Old Sep 15, 2006 | 12:34 PM
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are these designed to bolt right up to the factory y pipe at the cats? cause if so that would be pretty neat..
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Old Sep 15, 2006 | 03:55 PM
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Originally Posted by UnrthdxDream
are these designed to bolt right up to the factory y pipe at the cats? cause if so that would be pretty neat..
If you're asking about the Thorley's, in my case, no - they don't bolt directly up. The set I bought is for the 99-01 5.3's I believe. Mine is an '03. The Y-pipe will have to be fabbed.
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Old Sep 15, 2006 | 03:59 PM
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Originally Posted by Moddoo
Did the thorley guys tell you they were strongest at any certain rpm? Matches your cam range?
The headers are designed around the firing order. They should work great with any cam. They didn't mention RPM's but the gains will be strongest low-mid range with top end basically unaffected (maybe slight improvements). The RPM's at which their most effective would depend on your mods.
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Old Sep 15, 2006 | 04:03 PM
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Originally Posted by gonzo 6.0
Isnt the Tri-Y designed to benifit due to and engineered for the firing order?Look at these and look at the old SBC tri-Ys the old engine has a different firing order does this Y differnt than the old pipes?
How old are we talking? I don't know the answer to your question.
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Old Sep 15, 2006 | 04:13 PM
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Originally Posted by gonzo 6.0
My question is :are these tubes configured in a different order than the SBC,they should be since they have a different firing order.
If you look at the picture,it looks like 1-5,3-7,2-4 and 6-8 are Y'ed together. The old f.o. is 1-8-4-3-6-5-7-2 which would not seem to match that design. Since he said they're for 99-01,it would benefit that f-order,it seems. The gen 3 F.O. is 1-8-7-3-6-5-4-2 so the 3-7 and 2-4 Ys correspond to those headers............???....what ya think?
Last edited by shandy294; Sep 15, 2006 at 04:26 PM.
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