Now that I'm done putting in l05 350 in my 89 rs which is my daily driver woundering if anybody running l31 vortec heads on the tbi 350 and what are your hp/torque levels at I'm looking to get L31 heads and 4 bbl intake n tbi adapter or just rebuilding a L31 vortec 350 with 4bbl intake and tbi adapter for my permanent engine setup I want to be in 350-400fwhp and about the same torque.

I am running vortecs, see details in signature. Dyno2003 says about 400hp/435tq. It has not been on a dyno or the track.

OK not bad ...you have a 454 tbi I only have a 350 so I don't think Il get those same numbers I'm looking to get 350 fwhp or so around the same torque

For more than about 300 fwhp I would recommend a 2 inch bore tbi. Your 350 injectors can be used with an increase in fuel pressure. I am using 80# injectors at 20psi.

Rebuilt 350 l05
Rebuilt Transsmission rebuilt with a shift kit
Change all fluids to synthetic
3in exhuast with Flowmasters single in dual out
Heads where ported and polish and gasketmatch
Tbi was bored to 49 shaved butterfly shaft and removed the lip on top
Tbi rebuilt except injectors using injector spacer to raise height of injectors
And tbi spacer from cfm tech
Using stock intake bored to 49 mm intake gasket match
Planning on Modding fuel reg so it can be adjustable
And tbichips.com made a hot chip stage one took out old prom lol
Haven't dyno yet but not expecting much due to crappy heads cam intake

What would dyno 2003 say about my setup I dnt have computer to do so only mobile phone

Since you are getting custom chip tuning, its time for the cam as well. I like the LT4 Hotcam from GMPP, but the LT1 cam is a nice upgrade for you.

Vortec heads, a good 4bbl intake, and a nice cam and you will hit your targets for HP and torque.

Have you had your intake off yet? do you know if you have a roller cam or not? I have seen the truck L05 engines go either way, so until you get the intake off you won't know for sure.

You might actually be better off starting with an entire L31 core from the junkyard since it is a roller cam engine. Don't re-use that cam though, get yourself an LT1 or LT4 cam.

Good luck!

I was thinking of this set up to reach my goal with vortex 350
And I think I can reach my goal of getting 300+ HP I was thinking a polish for exhusast and a cam also
: * Vortec 4B high rise intake * 4B to TBI adapter * 350 ESC module - GM 16128261 * 350 knock sensor - GM 10456288 * 8746 ecm & injectors from 89 CapriceCop car * Headers (right factory exhaust manifold will not work on a Vortechead) * Flywheel 168T(flexplate)for 350 Vortec * Starter for 168T flywheel. * 1.6 Roller rockers (best upgrade to a 350 Vortec

Yea I rebuilt engine no roller lol the car versions had roller

Oh I forgot to add a custom tune from tbichip with setup

Could not do estimate without flow numbers from the rework done to the heads.

193 iron LO5 head: 178 intake; 146 exh

would this help its the stock flow data

cant find flow data of lo5 heads that been work on

HOPE THIS HELPS THANKS FOR DOING THIS

STOCK HEADS L05 DATA: 160.4 intake; 129.2 exhuast
PORTED HEADS L05 DATA: 177.4 intake; 162.5 exhuast

STOCK VORTEC HEAD: 225.8 intake; 149.2 exhuast
PORTED VORTEC HEAD: 231.7 intake; 172.8 exhuast

heres the links i found the data
https://www.thirdgen.org/forums/tbi/...-headflow.html
http://www.kendrick-auto.com/vortec_cs_gm_head.htm

L05-350-5.7L
8.3:1
194/202 - .385"/.403" - 112

Head ported according to data above
Mods as shown above (tbi bored, exhaust,etc)

Dyno2003 says 234hp/349tq

Hmmmm. Bout wat I expected. Thanks alot I know hitting that. 300hp will be along shot with a lo5 heads

I check your pics out of your car looks really nice I have to update. Mines I got it painted and new wheels how is it driving your car its a hand full or streetable

Add a comp xe268h cam and headers and you should be right around 300fwhp.

The car is used only as a nice weather weekend cruiser. Fun to drive, quite streetable.

OK you ever heard of these cams mellings mtc cam I founds these the numbers look pretty good


This is the 240 RWHP 350 TBI truck that I made mention to a long time back. This is the stock 193 numbers from above, a MellingsMTC1cam,Ultimate TBI mods, Stock intake, and headers.

RPM-------HP-----TQ 2,000----143----376 2,500----180----379 3,000----216----378 3,500----249----373 4,000----270----355 4,500----275----320 5,000----260----273

RPM-------HP-----TQ
2,000----143----376
2,500----180----379
3,000----216----378
3,500----249----373
4,000----270----355
4,500----275----320
5,000----260----273

With comp cam would I need to get the kit that include springs or just cam

My car is daily driver I see you have comp cam to it won't be to extreme

Not sure about that cam. Where did the numbers you posted come from, look on the high side if I am looking at the right specs.


Ah, see your relisted chart, was reading it wrong your numbers look about right

yes, I would recommend cam, springs, and lifters (with the comp or melling cam).

The comp cam I listed would be somewhat choppy idle. Everyone has their own idea of what is acceptable for daily driver, but I would say it would be on the upper end of what I find acceptable for a daily driver. ECU tuning could be difficult to get right with this much cam.

I'm looking online for comp cam one kit has timing chain cam springs hydraulic flat tap another kit cokes with hydraulic flat tap and cam and then there's just the cam s

Would stock springs work or would I bind them up in higher rpm

not sure about bind with the stock springs, but I think you would need heavier springs to stabilize the valves. Give comp cams a call and see what they recommend.

Yea I know computer. Tuning is a headache the killings are half the price of the comp cams but never heard of them

The more I think about it tbi vortec 350 seems to be easier route lol

Definitely easier to make hp with a vortec, up to a little over 400fwhp. However, I will tell you that mine was difficult to tune. A little less cam (less hp) with the vortec would be easier to tune for a daily driver. If you go for 325-350 hp with a vortec you can stay with your bored tbi and 350 injectors, this will also make the tuning easier.

that's wat I was planning just upgrading to 1.6rr off course use taller valve cover and add headers and be around 350hp nice and simple I already have 3in exhuast maybe I might redo it

I'm in the military sometimes I don't have tons of time for tunning but camaros it a never ending project

I know how it is; I was a CM2 once upon a time. There's lots of veterans on this site who get stuck doing rebuilds over at the auto hobby shop hahaahhaha.

Yea I'm a HM2 aka corpsman worse part I'm a field medic with marines well I got 11 more years to go lol

I just pick up HM2

You may want to think about EGR and stock hood clearance issues with a high rise intake.

Yea i know if it doest ill just get another hood or modify it

Can you run another setup i have ?

PORTED VORTEC HEAD: 231.7 intake; 172.8 exhuast
STOCK REBUILT L05 ENGINE BLOCK
LT4 CAM
3 IN EXHUAST
TBI BORED TO 49mm AND GOIING TO USE 4 BARREL INTAKE

VS

PORTED VORTEC HEAD: 231.7 intake; 172.8 exhuast
STOCK REBUILT L05 ENGINE BLOCK
LT1 CAM
3 IN EXHUAST
TBI BORED TO 49mm AND GOIING TO USE 4 BARREL INTAKE

IF YOU NEED MORE INFO THANKS ALOT

I know there are several versions of the lt1 cam. I found these specs. I believe the lt1 used 1.5 rockers and the lt4 used 1.6 rockers.

96-97 LT1 Dur 200/207 lift .447/.459 w\ 117 LSA
96 LT4 dur 203/210 lift .476/.479 w\ 115 LSA

Is this the ones you had in mind?
Also remember these are roller cams so you would need to convert the block.

Also, I used 8.3:1 compression for the L05. Is that what you are using?

Stock vortecs at .500 are 239 cfm intake and 160 cfm exhaust. Where did you get the lower number for intake ported?

From another post I had quoted the post above it could be wrong was searching and that's wat I found

Idk about the compression I just did I rebuild I know it came from 89 silverado I believed its 8.3 the heavy duty trucks got the 9.2

Having a hard time with Dyno2003. Does not seem to work well only with cam specs at .050.

Ran the following with Dyno2000.

L05
Stock vortecs
LT4 cam
Headers and exhaust

260hp at 4000rpm / 380tq at 3000rpm

What difference if it was the 9.2 compression ? I need to double check that's a good question

Thanks alot I know you don't have to do this and just blow it odd but thanks

You have no idea how much this help I wish there was a mobile app lol

That bumps it up about 12 hp. (272hp)

I really think these numbers are on the low side and would look much better if i had the seat-to-seat cam specs. A stock L31 is 250hp. The LT1 cam is very similar to the L31 cam. The LT4 cam should be better and I have added headers.

Yea I'm trying to get 300 HP so probably need around 340 fwhp need to the wheels its hard to research I have to research those specs

It's funny I get some different results with DD2000. I guess my dyno is more generous than yours!

L05
Stock vortecs
LT4 cam
Small Tube Headers and Mufflers
9.2:1 Compression
500cfm w/ Dual plane manifold

313hp at 4000rpm / 379tq at 3500rpm

W/ LT1 Camshaft
301hp at 4000rpm / 378tq at 3500rpm

I'd say that if you want to get into that 350 - 400fwp range your going to need to up the compression and use an aftermarket camshaft.

Like I said, I think the numbers I gave were on the low side. Don't know what the issue is that I am having with this one. I believe your numbers sound more reasonable.

I agree alvan. I have noticed big differences while creating cam files measured @.050 vs Advertised duration. DD2000 also favors some Roller cams from what I have seen.

To make the intended power range it will require better valve springs and some work to the heads for a little increased lift. You may consider some flat tappet cams since you have the L05.

bluers91,

What did you use for the intake centerline for the LT4 cam?

yea im going to up the compression when i take off the heads im chage the pistons mines are kinda has a dish in it hence lower compression so im use sum flat pistons when i change out to vortec heads

thanks alot yea im going to due that