I spun a bearing the other night.. Looking to build another motor.

I am just looking at some of you guys' opinion on setups. I don't have money for a 408/etc so it will be of a more budget built but want something I can grow on.
Looking to spend around 3K for the time being. The MAIN question right now is which block? I am pretty positive I want to go with Ls3 heads.

L92/Lq9/etc...

Here is my book.... Too much info is better than not enough.


I will break it down in a way that I think would be easiest for me to give the best answer.

Current setup/numbers/times
Stock bottom end ls1
ported/milled 317s
custom 226/228 .588 114
ported FAST 102/92
Stock MAF (will be moving up to a larger diameter MAF/lid later)
Kooks LTs/TSP Xpipe/1 chambers before axle
Chrs1313 Ram air
PTC 4000 (built 4l60e)
3.73 (stock 10 bolt) I will have a 9" shortly so no worries there
Nearly full BMR adj. suspension (dont have drag bar or front shocks yet)
Plate kit/Nano
Race weight is around 3450#... Nothing has been removed, I run Prostars at the track and I will not be removing any weight in the future..

Before the Xpipe/intake/tb/chrs1313 were added I had a nitrous tune on it and on a low dyno I did IIRC- 372/350
I put on the intake/TB and still had a nitrous tune, with no tuning at all I dynod (still on the low dyno) 380/365.

Before the xpipe/intake/tb/chrs1313 I was running consistent 7.3Xs@94mph 1.50-1.52 short times BARELY spinning the tires over. DA was around 2000+ (which seems to almost always be between 1500+ - 2500+ at my track).

Goals.....
As far as dyno numbers go, I could care less... I guess on a normal dyno if I had to pick a number I would shoot for around 475Rwhp?

Track times..
Motor- Consistent 6s.. Since my DA doesn't change too much at my track it shouldn't be too hard. I think with my new intake/tune/exhaust I have I would have been at a solid 7.1 in 1500+DA or so. I would love to see a personal best of 6.7X with the new setup..
Trap I don't care too much about, I would like to see 96+mph pretty regularly though and with good air 99 maybe. I don't know 1/4 times too well but consistent mid-high 10s@123+mph I think is what that would equate to.

Nitrous- low-mid 6s.. I am pretty sure my converter might play a roll in holding me back here. It isn't on the loose or tight side for a 4000, pretty much right on where it should be but I think might be too loose to spray a big enough shot to get me into the low 6s. I would be happy with 6.4X@105 or so. I have never ran that quick/fast so I don't know what to expect exactly. I would like to keep the shot at a maximum of 175 (I would do a 200 for a personal best maybe once a year for one pass) but I think 90% of the time I would have it jetted for a 150 hit. 150 shot would be the biggest on the street if I were to use it... I would run around with 100 jets in but probably only use in once every 2 months or so for maybe 2 races 40-130. Not too many street cars in my area that would be able to mess with me on motor, few bikes I like to play with here and there though. Again, not too keen on 1/4 times but I think bottom 10s-high high 9s @ 135 or so is what that would equate to?

I don't want a dedicated motor or nitrous car. I don't want to run 7.3s on motor and 6.2s on a 200 shot... Other hand, I don't want to run 6.7s on motor and 6.4s on a 10 shot. I want a happy medium somewhere in there.

I am up for changing anything, converter/exhaust/gears/tire size/intake/heads/etc etc etc....

Hopefully I put all that so it got my goals across... Talk it up!!

Also....
I can get a low mileage Lq9 for 1,300$
low mileage L92 for 2,200$
Can't remember the name, aluminum 6.0 (ly6) 1,800$
These are EXTREMELY low mileage/6 month warranty/shipped to me...

 

Just remember to add in the cost of converting your F-body to accept the VVT that's installed in the L92 and LY6 engines.

 

I know the lq9 is a direct swap, I have done that swap before.. is it so much more of a head ache with the l92 it isn't worth the few extra rwhp/tq and saved weight?

What would the power difference be with the prc 2.5 heads and ls3s? I know the cam selection will be greatly different.

 

Its not hard to take all the vvt stuff out of the L92 motor. Just change the lifters and cam then call up TSP and they will send you the ls2 front cover and everything you need to convert it over mechanically. Since the crank is a 58x crank you will need the converter box to make it compatible with your ls1 pcm, here it is

http://www.lingenfelter.com/mm5/merc...gory_Code=C163

You don't need alot of cam to make the L92 headed motor run. Call up Geoff@EPS or Patrick G and get something spec'd or you can just get something off of Geoff's site or TSP's L92/LS3 specific cams.

As far as the motors, I would choose the L92 since you would get the heads with it and those heads flow a ton and if you go bigger the heads will be right there for you. No need to buy bigger heads with them.

 

I thought you could take all the vvt crappy out fairly easy.

Lq9 is definitely cheaper and easier but I would love those few more cubes and the saved weight. I wanted an l92 to begin with.

What intake would you guys run?

 

On a stock cube L92 I would run a ported LS3. If it was a bigger stroker I would say FAST 102. GM did their homework on the ls3 intake unlike the ls1 vs. ls6 swaps of back in the day.

I bought an L92 motor and building a 418 with it. TSP sent me everything I needed to convert it over. Cost me a lil over 300 bucks.