Buck268

I was just wondering if anyone knows what the factory ratings for the L05 TBI 350 were, or at least were I could find them out. I am curious as to the HP and torque (of coarse), and also would like to find out such information as cam specs. Again, if anyone knows were this info can be found, let me know! Thanks!

Chevyman69

A general number is 210HP@4000 rpm, 300 ft lbs torque@2800 rpm. Cam is pretty crappy, I am not sure of duration lift is something like 375/399 not very good at all but it does the job.

PaulD

That's about accurate on torque and hp. The cam is low lift and the heads are not great. Both can be improved but then you will run into the stock TBI not supporting much more than 230hp. With the right gears, the torque makes a very fun car to drive.

Buck268

Gotcha. Thanks. Just what I was looking for!

BigL350

Hey Paul. I was thinking about getting the 300hp tpi 350 from autocenter, which is basically an LO5 with a better cam and $400 more on the price tag. I was wondering how much cam can it handle before running into retainer to valve guide clearance or other valvetrain problems? I'm debating wether I should get the LO5, put in a bigger cam than the one in the autocenter motor, and get the heads ported, or just get the 300hp crate motor, put on some 1.6 roller rockers and be done with it. Your opinion would be much appreciated.

kevm14

Let's just say that the L05, which puts out 205hp and 300lb-ft in my car, pushed my big ex-cruiser through the 1/4 mile in, well, see my sig. Imagine what it could do in an F-Body.

dmair5_0

so I would guess with lower gears, posi, good exhaust and a bigger lift cam, the LO5 should be good for high 14's in the 1/4? Everyone think that is about right? I am in the same boat looking at that engine.

Tas

I think that used the better iron 350 TPI heads. Same ones as the old 300HP 350 H.O. crate engine before the Vortec version replaced it.

kevm14

If you're talking about 350 heads, you are DEFINATELY not going to find better flowing heads than the L31s for the type of cam you'll be using in a TBI engine...

Boham92RS

I just installed an LO5 in my Camaro. The car has an Edelbrock performer TBI manifold, full exhaust, 3.42 posi rear and a vette converter. I am still breaking the engine in, but so far, the engine has much more power than the 305 ever did. Once its broken in, I will Gtech it and post results. So far, it feels like it has been well worth it.

PaulD

BigL350, first of all, how 'bout them Yankees? I'm sorry, but what place are they in today?
Anyway, I wouldn't (and didn't) use the LO5 heads. I'm not sure how much lift they can handle but they don't flow well anyway. To do it over, I would get the Vortec heads and Vortec TBI manifold from Scoggin-Dickey. Those heads will go up to .480 which is great for TBI engines.
Is that the 300 hp GM crate engine? Jim Pace has what they call a "Caprice TBI " engine for $1595 with hypereutectics, Powdered Metal rods and 64cc heads. Look into the heads. L05s came with 76cc heads, I believe. They may have upgraded the heads already. They say it'll make 300 hp with a cam change, but the stock TBI wont flow enough fuel to get that much hp. Don't automatically go to 1.6 rockers until you find how much the springs will handle. Less than .500 is fine for electronically controlled injection.

That is a friggin' great price, IMHO, for what you get. If the heads are halfway decent, it's a steal.

Hope that's helpful.

vjo90RS8

iTrader: (1)

Next christmas i plan on swapping an LO5 w/ Edelbrock Performer TBI, LT1 cam, 1.6 rockers, 3.73 gears w/ SLP take off posi, and a bored 48mm TBI. I also plan on either transferring my current TES headers or just buying a new set of Hooker Super COmps. That better get me into the mid to high 14s and hopefully into the low 14s, high 13s with some TPI heads, a probuild HD tranny and a 2400 stall converter.

kdrolt

What Paul really meant in the above is that the stock TBI:


1. can flow enough air to support 310+ fwhp;
2. can flow enough fuel if the injectors are sized properly, and you have adequate fuel pressure. more power means more fuel;
3. the ECM is reprogrammed to handle both of the above.


So the stock TBI/fuel_system/ECM will be limited to slightly above stock torque and power no matter what mods you make, because the engine is controlled by a speed-density computer. To get more than 210+ hp and 300+ ftlbs (roughly the stock LO5 specs with TBI), you need to deal with items 1-3 above.

- Ken, more long winded than Paul... <g>

PaulD

Thanks Doc. Yes, he is. But it's a good thing.

When I saystock TBI won't handle 300 hp, that just means we gotta make it non-stock . Doesn't mean it can't be done. Innovate and improvise.

kevm14

Hey Paul, are you going to be at Epping on April 27th? I think I am going to - still trying to squeak out that 15.6x-15.7x @ 87

PaulD

Hi Kev,
I'll be at BK for a cup of coffee at least. I coach my son's Little League team and I have to umpire one game from 12-2 and then our team plays at 5:00. There are also some opening day events in the morning that I'm backing out of to come. If I can swap umpire duty with another coach, I'll race. If not, I'll just be there in the morning to meet everybody. Of all days.

15.501 @87.xx

Still need to install LCAs, intake and H-pipe. vAFPR tuning later in the summer.

BigL350

Thanks Paul. I haven't taken my head out from under my hood long enough to keep track of the yankees. The Rangers have been consistently disappointing though. As for the motor, my car is a stock IROC with TPI, so it looks like that motor will be perfect. I want something mild to replace the 305 once it starts to show it's age. I just cruise with my vert anyway. When I get some more info from autocenter, I'll post it. Thanks