You would have to lower the compression and get forged internals.

 

watch it with the import comments...ill have to prove you wrong again.

ill be a little nicer than most here. the L is like said a SOHC S/C 5.4. powdered rods and i believe hyper pistons. the cobra is an iron block 4.6 (all other 4.6 mustangs are aluminum stock) with a forged crank (ALL cobras from 93 to the present have forged cranks tho), forged rods and forged pistons from straight from SVT.

like was said a cobra can make 500whp with a ported eaton blower, you can slap a kenne bell on it and make 600+whp. a whipple is right there also. theres a mustang on www.modulardepot.com that trapped 131mph with a whipple and i believe all the bolt ons on a stock bottom end.

an ls1 can make just as much hp on a stock bottom end. it would be wise to run alky injection at that point but if you minimize detonation you should be fine for a good little while (but not as long as you would on a cobra). hell that theif raymer made 800+rwhp for a LONG time on a stock 120k mile 98 formula. the secret is to stop detonation. you detonate and you are done.

to build an ls1 you really just need rods, bolts, pistons, rings and head studs. the factory crank is fine. unless you want it nitrided or something. but harlan is trapping 170mph with a stock crank in his firehawk..

 

2v Gts have iron blocks
4v Cobra blocks are aluminum

I still don't think no LS1 is going to hold over 500 rwhp. If it does not for long at all.

 

03-04 cobras are iron also. 01 and under are aluminum.

local guy has made 550rwhp with heads and cam with nitrous for over 2 years. and tell me what about 500whp makes it different from 400whp that would cause it to break. besides detonation.

 

i was talkin other then the 03-04 Cobra, there built for boost they need an iron block.

We were talkin FI LS1s, with the PSI in a high compression motor (LS1) 550rwhp will blow soon, I knew a few guys running 500+ FI LS1s. both blew in a month. With that compression and presure being forced in it will not last.

Like I said apples to oranges the Cobra is forged and will handle 90% more power then an LS1.

 

It's Cammy! Whats going on man? Long time no speak Prove me wrong *again*.. i dont think you proved me wrong in the *first place* But thanx for chiming in on this convo Very good input

 

i can do a search for ya...

Joe you still havent told me why 500rwhp seems to be a magical number for ls1s to blow up at. if it detonates, sure, it will blow at 300rwhp. but if you CONTROL DETONATION you should be good for a while. of course this isnt taking into consideration the added stress a S/C puts on the crank snout or anything. but i fail to see why it will blow at 500. please explain.

 

What he said!!!!! The stock rods in the L are powder iron rods. Good for about 14 psi and a GREAT tune

Later

 

I'm as avid a fan of the F-body as there is, but I've got a buddy...

10.97 spinning off the line...

It's all in how much you wanna spend.

 

What about the guy who ran a stock LS1 with well over 100k to 800 HP with a big turbo. It lasted a while as well.
I will give credit where its do. The Cobra engine is Wonderfule.

 

I think thats some BS. One of my friends has a ATi Blown 00/LS1 Vette that makes over 560HP with stock internals and has had a blower on it since 2001.
Its a fricking MONSTER. Still runs great.

 

Ya.. but the sad part is this "sucking dick" LG4 will stomp your *** into the ground

 

So what does your "estimated" 300 hp LG4 run?

 

In my xperiance that is what ive seen, but like I said that was FI not NA. The pressure flowing through the intake into the cylinders with FI make it that much more harsh, also more heat.

 

heat is what leads to detonation. if you keep heat (and subsequently) detonation under control your motor will last for a while.