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lsx 408 rwhp...is this good?

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Old May 23, 2016 | 02:42 PM
  #21  
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Hmm do tell...I live in vt they are 3.5 hrs from me...u think they screwed me?
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Old May 23, 2016 | 03:09 PM
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Originally Posted by Lsx408invt
Hmm do tell...I live in vt they are 3.5 hrs from me...u think they screwed me?
Idk what they did, I'm just letting you know. I will pm you and let your thread stay on topic.
Those do seem like good #s man congrats.
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Old May 24, 2016 | 11:58 AM
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You could pick up a chunk of hp and tq by upping header size, doing a FAST 102, and going to true duals. The degree to which you would benefit from a tune depends on your combo and how spot on the current tune is. I'm betting you would benefit significantly from a retune, you'd be getting significantly more airflow in and out. If you do all of it, I would not be surprised if you picked up 40+ at the tire. Excellent numbers regardless.
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Old May 24, 2016 | 12:51 PM
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Originally Posted by jmilz28
You could pick up a chunk of hp and tq by upping header size, doing a FAST 102, and going to true duals. The degree to which you would benefit from a tune depends on your combo and how spot on the current tune is. I'm betting you would benefit significantly from a retune, you'd be getting significantly more airflow in and out. If you do all of it, I would not be surprised if you picked up 40+ at the tire. Excellent numbers regardless.
We all sort of jumped on "where is there power still left on the table?" But yes, these are very good numbers. There have been a lot of 408 builds lately that haven't been hitting 500's, so it's nice to see one do it and still have some room to grow. Sounds like a very well built motor.
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Old May 24, 2016 | 01:46 PM
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Thanks..they did their research on the motor for sure...I guess it depends on how much I wanna spend..I haven't even been able to find a mustang to play with yet lol
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Old May 24, 2016 | 05:20 PM
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Originally Posted by Lsx408invt
Thanks..they did their research on the motor for sure...I guess it depends on how much I wanna spend..I haven't even been able to find a mustang to play with yet lol
You'll have trouble with that for sure. You know how you can tell the difference between a loud exhaust and a powerful motor with a loud exhaust? So can mustang drivers. Especially once the locals get used to your car.

Don't be surprised if at lights people stay back a half a length. THAT's respect!
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Old May 24, 2016 | 05:38 PM
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That's true. Even with my car, after doing heads and cam I noticed no one wants to try and pass me at the stop lights anymore. It would be a very boring lonely world with that 408 sound.
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Old May 24, 2016 | 05:38 PM
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Very true...I know a few mustang guys I can play with..haha
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Old May 24, 2016 | 05:47 PM
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Hey can I email one of u guys my dyno sheet to post?
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Old May 24, 2016 | 07:11 PM
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OP Dyno sheet Posted
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Old May 24, 2016 | 07:25 PM
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Thanks Darth!!
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Old May 24, 2016 | 07:44 PM
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so um... what kind of engine is a 408? What does it come from/how is it related to an OEM engine?
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Old May 24, 2016 | 08:18 PM
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Originally Posted by kingtal0n
so um... what kind of engine is a 408? What does it come from/how is it related to an OEM engine?
Seriously?
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Old May 24, 2016 | 08:43 PM
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Originally Posted by KCS
Seriously?
Is this an LQ9 stroker? Or can it be an LS1 variant stroker? Or can it be a very NON stroker 408 cid from a certain car somewhere... there are more than one way to build a 302, 327, 347, 383, 377, etc... 406 could be a 2-piece rear main seal. So the guy says 408, doesn't mention the rear seal or generation, could be anything? obviously this is not a 2-piece block but you see what I mean.
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Old May 24, 2016 | 08:59 PM
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4.03" bore x 4.00" stroke
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Old May 24, 2016 | 09:03 PM
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Originally Posted by kingtal0n
Is this an LQ9 stroker? Or can it be an LS1 variant stroker? Or can it be a very NON stroker 408 cid from a certain car somewhere... there are more than one way to build a 302, 327, 347, 383, 377, etc... 406 could be a 2-piece rear main seal. So the guy says 408, doesn't mention the rear seal or generation, could be anything? obviously this is not a 2-piece block but you see what I mean.
99% of the time, it's a 6.0L iron block with a 4" crank and a 4.030" bore. It's kind of common knowledge in LS land, like how in SBC land a 383 is usually a 350 block and a 3.75" crank and in SBF land a 347 is usually a 302 with a 3.40" crank.
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Old May 24, 2016 | 09:27 PM
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Yes sorry I figured it was common knowledge.. Based off a LQ9
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Old May 25, 2016 | 10:45 AM
  #38  
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Back to the op. That motor is strong but it does look like your AFR could use some touching up. At about 6300-6400 it goes under 12. Maybe It would help carry the power further rather than nose over at that rpm.
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Old May 25, 2016 | 12:19 PM
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Yea I see that.. I guess as long as its on the fat side its safer..maybe opening up exhaust and intake would help?
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Old May 25, 2016 | 01:08 PM
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Originally Posted by Lsx408invt
Yea I see that.. I guess as long as its on the fat side its safer..maybe opening up exhaust and intake would help?
You are right about being safe. Going into the 11 territory is a bit much for N/A I'd think. I bet if your AFR carried straight, instead of that drop at the end, your power would too. Probably/maybe lol.

If you're going to switch your intake/exhaust, perfect time to get it touched up & see the effects of the changes.
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