mustang_1noskid

How's it going? I am looking for tips and advice from people that have had good experience building the gm gen 3/4 "ls" series motors specifically the iron block truck motors like the "ls3" I am wanting to build a motor to put in a street/drag car that can also be driven occasionaly during the week I have worked little with the gen 3 motors but I have built several small and big block gen 1 chevy motors and big and small ford motors , Im looking to do something with a "lsx" and a small cam to make good power have god sound and perfrom things like an 11 sec quarter and be able to go 160 at the salt flats or a long straight road with no cops , I own a stock 07 mustang(s197) and Ive thought about tearing into it however , for preservation of that car , I am seriously considering buying something cheap like a square body s10 single cab shortbed with a lsx non carburated using ditautotunes new stand alone system either a t56 or a 4l80e with a 15-2500 stall and a ford 8.8 with 3.73:1 I am a little concerned about the back end being so light but I have owned a square body v8 s10 before and I moved the motor back about 3 inches and welded a 190 lb. back bumper to the frame and that prooved pretty well no matter how I drove it . I also owned a 78 gmc with a gen 1 400 destroked o a 377 with true double hump heads edelbrock torquer II intake and 750 cfm carb th400 trans and gm 10 bolt it ran pretty well too and got about 14 mpg and had plenty of hp and torque for me also sounded really nice with a lunati bumpstick . Last night I had a dream about a detroked 6.0 I woke up this morning and have spent the entire day researching wether or not that was even possible and in my search I found a video on youtube of a 334 ci destroked 6.0 , I was thinking more along the lines of a destroked lm7(5.3) with a 4.8 crank and rods(since they are the same block for the 4.8 and 5.7) and having the block bored out to 3.903 with wiseco pistons and then adding in a howards drag racing cam(278/297 and .625"/.625" 113 lsa) and programming the setup for peak mid-range performance at least 450hp has anyone ever heard of such a thing? I typed it in to a few calculators for extreme mechanics and it came up to a 313 cubic inch with l92 heads and ls6 truck intake and 90mm tb with a 9.1:1cr making on the calculus making 480 horse peak power from 2500-7000 capable of being spun up to 9k with the right oil pump and larger injectors anyone have any suggestions? I want something that will sound like a 502 on steroids and have power similar to a 600 street bike ! Any help is appreciatee thanks!!

JD_AMG

I gotta ask, why destroke? And why such a low compression?
For the trouble you are going though to make 450RWHP you could just do a nice size cam (nothing as big as like a 278/297) and get that with a 6L on stock internals.
Something like this:
https://ls1tech.com/forums/dynamomet...-06-vette.html

bww3588

iTrader: (49)

A stock ls3 with a good cam will put down almost 500 at the wheels.

AES Racing

iTrader: (6)

Sounds like this is going to be a really fun car!! Mid 11s, 160 on the 'Flats, a raspy idle, pump gas, and the ability to spin the tach to 9,000 rpm!!

I am thinking though, using the 5.3 to 5.7 block with the L92 head will encounter clearance issues. (as the 2.16 valve will impact the block) Using the 6.0 block (taking advantage of the bore to avoid the dreaded valve to block impact) will be the best plan, with a de-stroked crank, will produce 334 inches.

02silverstang

iTrader: (7)

what about using the 4.8 stroke crankshaft and the 6.0 block bored to 4.010 and then you can use the l92 heads and it will be a monster. 328 ci with the potential to rev over 8,000 rpm plus the + side is you can use any heads you want with out worries on clearance issues. just me 2 cents.

99tramsamc/fia

iTrader: (2)

use the 6.0l. destroking the motor is going to kill your mid range torque. i to love to see the tach go past 9000, look at the viedo i posted on you tube (mean street firebird) you will get i better idea of what happens with 8300 rpm shifts.
You will not be able to take avantage of that l92 head on the 3,900 bore. it will fit with valve notches in the block at the top of the cylinder, but it is going to kill airflow. As for your power goals i,ve made over 600hp with a completely stock ls6(243) head on a 346For me if i was going to build a Street/darg car i would try to find a ls2(alum 6.0l) or a ls3(alum. 6.2l), send the stock head out for a clean up, throw a big cam at it and drive it everyday. Shold make 500+ and be a blast on the street. In a s-10 it will go well into the 11's maybe even a couple high 10 sec passes.
Good luck with the build. Let me now if i can help
Dave

blue00ZZleeper

iTrader: (5)

I see the concept behind this idea. Usually the easy way to achive those numbers are as the others said in going with a 346 heads/cam combo. I was looking at doing something quite similar just as a side project....I was looking at using a 6.0 block bored out to a 4.030 (To decrease valve shrouding and maximize potential air flow) with a 4.8 crank. I was also looking at some machining ideas and what it would take to run a flat plane crank.

SilverSSuv

Dude, if you got the will, the cash and the capabilities to be diff. Go for it. If I had the cash, I'd be building an NA version of the new 327 copo Camaro engine. (I think this would make a great 302 boss fighter in the Camaro)

LM1 Clive

I'm selling my Stock LS7 to fund a short stroke motor at present.
The Idea of a LS7 block with a 3.25" stroke making a 350ci motor that can rev to 8-8.5k really apeals to me. Power can be had just by boosting the motor, and my car is only 2250lbs so I dont need lots of Torque to pull it down the strip....

So go for it bud, build a Skreamer.....

NemeSS

iTrader: (127)

343ci screamer is what i would build if i had the cash
4.085 (+.020) bore ls3/l92 block
3.268 (4.8) stroke crank with connecting rods
dome pistons, smallest cc chamber head available, rectangle port with hi ram intake
240s duration,.625-.650 lift cam on aggressive lobes
Jesel shaft mounts (of course!)
Spin it to 8000+ (steel scattershield needed in case clutch disk decides to try and be a big shuriken)