LSX Vs. LQ9 Engine

**NeeD4SpeeD** · 07-19-2009, 02:53 PM

Ok....I've finally saved up enough money to follow up with my stroker motor project ($17k to be exact

) Now the only question is which motor do i go with... I already have the parts i want lined up and ready to go but i seem to be stuck at the motor.

Now, i know that the LQ9 is plug and play with our LS1 cars & parts but what about the LSX??? I know it is a 6bolt config for the head assembly and mounting to the K-Member is alittle different but what else is there that i should be aware of??? I dont want to have to modify everything just to squeeze the LSX in the car.

So you all know, the car is a weekend car but i would still like to make use of the AC and all other functions of the car. I don't want it to be a track only car because that's not what i want. Having said that im shooting for either a 408 or 427 low compression to support the Procharger F1R i have sitting in my garage

Would the LSX be better suited for the 427 then the LQ9 or would the modifications to make use of the LSX out weigh the benefits of it?

Any and all opinions and help would be appriciated. I will post pictures weekly with my progress on building the motor when infact i settle on either the LQ9 or LSX.

PS- I know all the specs for each engine (IE iron, wall thickness etc) just want to know which will be the least amount of with that i could suck the most amount of power and TQ out of

Edit: LSX poll option is supposed to be 454 not 427

**0verkill** · 07-19-2009, 06:25 PM

i would say go big or go home so lsx is my vote

**NeeD4SpeeD** · 07-20-2009, 04:55 PM

Originally Posted by 01 T/A

i would say go big or go home so lsx is my vote

I agree... Was originally planning on going with a 454 LSX and using the LS2 conversion kit... Figured the TQ from a 454 would be absolutly insane... Plus an LSX block is just built as strong as you can possibly get...

**99transamC/FIA** · 07-28-2009, 09:52 AM

money on problem. No question LSx!
Run a 4.125 bore with 4.0 crank(427). With a blower easy to make 700rwhp.

**NeeD4SpeeD** · 07-28-2009, 10:38 PM

Was leaning toward that myself... Although was eyeing a 454 just because it would be a sick torque monster in a WS6! I have the money to blow, i actually already have the procharger sitting in the garage... Just the final decision is the motor

**0verkill** · 07-29-2009, 07:26 AM

do it

http://texas-speed.com/shop/category...MID=1&catid=84

**Spaz** · 07-29-2009, 08:41 AM

get the LSX and stroke it to 500 cu in!!!

**NavdeepWS6** · 07-29-2009, 09:21 AM

ive seen a 454 lsx camaro that was making 587rwhp all motor and that thing moved

ive seen how much my dream engine would cost and its around 20k easy

i say run the lsx

**Spaz** · 07-29-2009, 12:17 PM

also keep in mind if you're going to be making a shit load of HP make sure you have a devent rear and trans...

**6.0LiterImportEater** · 07-29-2009, 01:05 PM

The LSX is a great design! Shit you can bore and stroke it to a 504 cid!! Can I say YUMMY!?!

Downfall.......its expensive.

If your going with a 427 cid then the LQ9 might be your best bet (or LS7 block). It can handle the abuse of the procharger with that bore and stroke. Now thats about all your going to get out of it though....

If you want 454 or bigger.........fuckin LSX man!

Good luck on your decision........and may I say jealous!

**NeeD4SpeeD** · 08-02-2009, 12:29 AM

Thanks for all your feedback!... I have agreed to go with the LSX 454!!!!. I currently have a laundry list of parts and prices lined up for it which i will post tomm to get feedback on.

As for the rear, i have the moser 9-bolt with 3.83s (Because i think my current 4.11s would have too quick a gear ratio for 550+RWHP)

Still in debate about the transmission because i want to keep it stick for sure but was wondering if i could get an aftermarket M6 that will hold the HP im going to throw at it? I know i will never get to the 6th gear in a drag but its great for gas mileage on the HighWay

As for power adder... I currently have the F1 procharger sitting in the garage screaming at me nightly to attach it to the motor

gunna wait for the badboy LSX to arrive...

I'm going to get it through TSP because they have the best assembled price i've seen around and are EXTREMELY helpful over the phone so they get my business!

I will keep up dating weekly as the build progresses and pictures also!

Once again thank you all for your input and help in making my decision... Hopefully it will be fully done by next summer and i can bring it out on cruises with everyone!!!

**0verkill** · 08-02-2009, 07:49 AM

good deal its going to be bad ass. as for the trans you can get it rebilt with the viper upgraded parts that fix the week spots in are trans now.

**anniversary30** · 08-02-2009, 08:05 AM

I just had my trans built to the viper upgrade for future build of a 408 with a d1. 700+rwhp and they said it would be more then enough for it so, I agree with 01TA. Just find the right guy to do it for you.

**0verkill** · 08-02-2009, 08:48 AM

Originally Posted by anniversary30

I just had my trans built to the viper upgrade for future build of a 408 with a d1. 700+rwhp and they said it would be more then enough for it so, I agree with 01TA. Just find the right guy to do it for you.

if you dont mind me asking how much did it run you to rebild it like that?

**NeeD4SpeeD** · 08-02-2009, 10:41 AM

Originally Posted by 01 T/A

good deal its going to be bad ass. as for the trans you can get it rebilt with the viper upgraded parts that fix the week spots in are trans now.

Niiiice. So i can still keep the same trans and just grab the upgrades...Awesome...How much "SHOULD" it run about?

**NeeD4SpeeD** · 08-02-2009, 10:51 AM

Originally Posted by anniversary30

I just had my trans built to the viper upgrade for future build of a 408 with a d1. 700+rwhp and they said it would be more then enough for it so, I agree with 01TA. Just find the right guy to do it for you.

Im with 01TA, how much if you dont mind us asking??? And where could i buy the viper upgrade parts?

**anniversary30** · 08-02-2009, 12:14 PM

Yes, everything is in the stock housing. I had mine done by finish line trans in illinois this spring. To have it done it was 2800 and change but finish line performance did all my install . If you can do it yourself it would save a bundle. shifting is easier now, like butter. It seems like the harder I push it the easier it is to hit gears. Since install haven't missed 1 gear and 3rd was always a problem for me. Not any more. great investment. I highly recomend it. Even if you never build the car to that potential you should never break it.