Watch OUT, that 5500 RPM is certainly a bottom end KILLER

http://ls1tech.com/forums/lt1-lt4-mo...only-dyno.html

Definetly going to guarantee a failure that high up


http://i203.photobucket.com/albums/a...hcorrected.jpg

6000 RPM, watch out stuffs comin unglued !

 

It's not really a fantasy build if there are repeatable numbers by a large group of people out there. It's not just one single post. It's many posts and many videos of dynod and dragstrip runs. 400hp at the crank is normally in the range 310-330rwhp for most cars depending on drivetrain loss. A properly tuned stock headed lt4 hot-cammed lt1 with boltons will make about that much power.

Lt1s LIKE big cams, the intake and the heads will support it well enough.

You want perfectly streetable a hot cammed lt1 is an easy choice. There are guys running much more wild cams on the street.

 

figured a link would pop up with their "stock" w/cam build. Oops theres headers rockers TB etc etc. Suprise!

 

"cam only" is a term typically applied to the ENGINE itself, and not external pieces specific to the chassis and not immediately a part of the engine.

Though I'm not surprised you dont understand the concept.

 

No one ever said for the op to do a cam only. The valve springs themselves need to be done as well. And it's not good practice to do a cam before doing the recommended external mods.

I don't honk I've ever seen the term "cam only refer to literally cam only. It's mostly used on forums to describe an otherwise internally stock engine with stock heads and rotating assembly. The boltons are a given for the term.

Several times the term "bolt-on" was mentioned. This is required to get the most out of any engine combo. My Lt1 gained about 60hp from shorty headers and a CAI. The typical bolt-ons.


Can recommendations for off the shelf grinds in order of aggressiveness. Typing these from memory it's been a while since I looked at the specs.

LPE74211. 211/219 on a 112lsa (utter sleeper cam)
LPE74219. 219/219 on 112lsa. (the SuperRam cam)
LT4 hot cam 218/228 on 112lsa
Cc503 224/230 can be had in 112 and 114lsa variants.
Cc306 230/244. Considered to be the biggest street able cam. Any bigger and you need heads.

All of those cams want heads, even a stock lt1 cam would benefit from head work. But every one of those cams provides good results on a stock headed lt1.

The list is mild to wild. Cc503 can be run with stock gears and stall.

 

If you want to change the goalposts and start redefining commonly accepted terminology, that's fine. But the point that I was making is that a stock heads, stock intake, stock bottom end LT1 can make 325-400 crank horsepower with a big cam.

Either way, I hope the original poster is simultaneously aware that he has a ways to go before he can start swapping cams in and getting gains, but I hope he also sees that the LT1 platform itself is VERY easy and cheap to bump up to 400ish hp with stock engine components. Beyond 400 crank horsepower I think it's better to move to a Gen I or Gen III/IV setup, but I think LT1's are about the cheapest legitimate 400hp engines you can get in these cars all costs considered. A turbo L98 might outperform it for cheaper, but thats beyond the ability of most.

 

Don't take this comment the wrong way, as I see you're one of the people offering sound advice to the OP.
If someone is starting from scratch without either platform in their hands already, then I'd agree with you. Gen I and LSX variants have more versatility and industry support in most chassis's.
But when it comes to producing power, 400 rwhp is now the norm for heads/cam LT1's, and the LT1 block just like the Gen1 can be pushed to higher power levels than the factory LS heads with their 4 bolt/cylinder arrangement will withstand. I just don't want the OP to get the impression that he must rule out a significant bump in power from his LT1 further down the road.

 

Uhh, no. 1,203hp. Read below.

http://www.hotrod.com/techarticles/h...g_bang_theory/

 

Yes, I know........a magazine article
It's just not happening in the real world

 

And to the OP of this thread. Since you are starting out with a B-body LT1, the heads will have to be machined for larger springs that are needed with a larger cam.

And if you want, I have a Lloyd Elliot cam that works great with stock heads. Its similar to a CC503 cam but has some pretty wicked LIFT so you'd need better springs/rockers to handle it. I've decided to step up to a larger cam now that I've got a rebuilt short block coming and I never installed this cam. Still have the cam card and its still in the original box too.

With ported heads and associated bolt-ons this cam can make 400rwhp+ on a stock shortblock LT1.

 

and by "not happening", I meant an engine like the one in the article staying together.
Anyway, we digress. Unless I misunderstand, the OP isn't shooting for anywhere near the power limit of any of these engine platforms.

 

Of course, I dont mean to imply that the platform is inferior to an sbc (optispark notwithstanding), there's just less selection and the bang for the buck for a 350-400hp cammed LT1 is incredible compared to all the other options out there. The sky is the limit, but the costs start to even out a bit past that power level.

 

I dont see that making much sense, an LT1 is easier/cheaper to put a h/c package on that will put down 420-440rwhp, getting there with a gen 1 will typically cost more, beyond that I guess it might be cheaper to do a gen1 over LT1 for 450-500rwhp ? Maybe ? but realistically over that on gen 1 for something streetable is going to require boost, and then we're back at just having two similar engines with different water pumps.

 

True. Because the LT1's come stock with much better cylinder heads than the Gen1's. After you surpass the capacity of ported stock heads, that's when Gen1's start to make more sense.
BTW, ported stock head LT1's are putting down over 500 rwhp behind automatics with non-locked converters. That's about 625 at the crank. And we're doing that within the 7000 rpm limit of the stock OBD1 and OBD2 PCM's

 

first mods I did to my 4th gen were long tubes, CAI and 3 inch cat back.

I also deleted AIR and EGR and had a tune done by Solomon and the car woke up. Heck, it woke up enough to grenade the tranny

Then came springs and 1.6rr's. It's plenty and blows off the 275's in the rear.