Lsx408invt

Hmm do tell...I live in vt they are 3.5 hrs from me...u think they screwed me?

senicalj4579

iTrader: (41)

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.

jmilz28

iTrader: (13)

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.

Darth_V8r

iTrader: (4)

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.

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

Darth_V8r

iTrader: (4)

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!

senicalj4579

iTrader: (41)

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.

Lsx408invt

Very true...I know a few mustang guys I can play with..haha

Lsx408invt

Hey can I email one of u guys my dyno sheet to post?

Darth_V8r

iTrader: (4)

OP Dyno sheet Posted

Lsx408invt

Thanks Darth!!

kingtal0n

iTrader: (1)

so um... what kind of engine is a 408? What does it come from/how is it related to an OEM engine?

KCS

iTrader: (20)

Seriously?

kingtal0n

iTrader: (1)

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.

SoFla01SSLookinstok

4.03" bore x 4.00" stroke

KCS

iTrader: (20)

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.

Lsx408invt

Yes sorry I figured it was common knowledge.. Based off a LQ9

SoFla01SSLookinstok

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.

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?

SoFla01SSLookinstok

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.