RUN from that guy as far as TBI knowledge. The GM TBI intake SUCKS for real power. Its only good for a daily driver with a small cam and stock vortecs. I ran a modified by me Edelbrock Victor Jr 2bbl Vortec single plane with a 2" bore 454 TBI on my Van. Torque curve kicked in strong, early and held steady well past 6,000 rpm. I ran the 350 over 6,500 rpm on more than one occassion. Still pulling HARD.

I would never run a dual plane on another TBI engine after running this single plane. I used a TBI-2bbl carb adapter from TransDapt and radiused the manifold to clear the throttle bores and unshroud them. Plenty of material to do it with.

 

What kind of hp were you running with that set up? I've just been reading up on getting my TBI bored out to possibly 2 inch or buying one out right.

I'd like to keep the stock TBI for ease of installation.

Also am thinking that when I get started on this engine that I am thinking of retarding the timing on the LT4 hot cam by 2 to 4 deg but I have to check around on that idea to see if it is feasible.

Thanks for the input on the manifold it opens up all the options

BTW I don't have smog testing where I live........lol the possiblities....

 

I was making roughly 465 hp at the flywheel and about 380 at the wheels. This was in a fullsize van with a Semi Floating corporate 14 bolt rear-end, 2,600 rpm stalled 700r4, and heavy 2 piece driveline with 3 u-joints, all power robbers.

 

Damn lol I don't need that much hp

I'd be happy with 350 fwhp

 

It was fun to run mid-low 14s in a 5,500 lbs fullsize van. Knowing that I was still running 3.08 gears and a tractionless 2.2s 60' time. It was fun running from a 20 punch.

 

I have a 88 camaro with a 2.8L-60 engine an I want to put some power to it. The car has been sitting up since 2002. where can I get these info, or books, guides on performance these engine.

 

Welcome to TGO

Please read:
https://www.thirdgen.org/forums/anno....php?f=22&a=60

There is section just for you V6 guys
https://www.thirdgen.org/forums/v6/

 

Ok I could not have found this thread at a better time. I sent a pm to the host, however I can use as many ideas as I can. I have a 350 out of a suburban from 86. the motor was rebuilt by Jasper Motors so it actually only has about 65K miles on it. Will this block be good for the swap you guys are talking about? What do you guys suggest I put into it if it is good to use?

 

ok I already have the Vortec engine and have it tore apart awating taking it to the machine shop. There is a question I have about what springs to tell them I need, when I take my heads to get done what springs do I tell them I need for this lt4 hot cam.? I have been buying parts (even though most of the numbers can't be found on gmpartsdirect) and don't want to end up getting the wrong thing here. If I get a TBI off of a 350 I am guessing I won't need the regulator (that is also not to be found on gmpartsdirect) is this correct? All I should need is a 350 prom for my ECM correct? Sorry for the questions that may sounf stupid to some but this is a project I am doing with my son and it will be something he will be driving and want it to be dependable and something that he feels he did wrong because I got the wrong parts and something fails in the engine

 

I know this is a old thread and even though I have never gotten a response from anything I have asked in here I need to know about this Cloyes 9-3145 Timing Chain/Gear Set, it says it will not clear the plastic timing cover. Is there one that will work with the plastic cover mentioned in this thread and if so whats the part number

 

The search function works quite well. But also some of the gurus maybe on vaction.

You'll need to tune that ecm to your build a mail order chip won't get you the full potential.

Also there is a couple of posts here on the forum in regards to some bee hive springs for the vortec heads that give you more lift with out machining

oh yeah go to www.dynamicefi.com one of the members here his site. Awsome info on TBI stuff

http://www.carcraft.com/techarticles...ade/index.html

https://www.thirdgen.org/forums/tech...97-vortec.html

https://www.thirdgen.org/forums/tech...installed.html

Hope this helps, I ve been doing some research and have different pages saved to my favorites for future reference

 

Thank you

 

also go to www.summitracing.com. I buy stuff from them. They also have on online tech you can chat to help you out. Christ he even can give me the shipping prices to Canada.

keep on asking questions and use the search you'd be surprised by the info on this forum on the l31 vortec

 

[quote=Fast355; I know of two dataloggers for the $OD PCMs , Datamaster and Tunerpro RT
quote]

So would the free version Tunerpro work with $0D or just Tunerpro RT ?
Awsome wright up !!!!

 

Ran across your posts by accident looking for something else and found that you seem to have most of the answers to one of my projects that's been dormant for a while, and your just down the street !! But I have a few questions. I started building up a '93 C1500 Ext Cab PU as a tow vehicle for when I retire. To date I have built the all forged, internal balanced, 383 w/ e-tec 170 heads (comp set @ 9.5:1), Comp Cams 266HR-14 hyd roller, GM TBI vortec intake, 350 TBI bored to 2" and flowed @ 750cfm+, adj FPR, and a set matched set of 90# injectors in a new 350 injector pod. Also have Walbro 255, Bosch 3 wire WB, Dynomax 87707 CARB headers, Walker 15147 Hi-PO 3" Cat converter & Flowmaster 3" single outlet Cat back system. Also have all the GM/Edelbrock parts to adapt the EGR. Transmission is a PATC 4L60E Raptor Level 3 w/ the Torque Drive pkg & 1800RPM 2x converter.

Now, the question is, what PCM can I use w/ this to get the most out of it, and still pass our Tarrant County Smog checks ? The shop that does all my smog testing says he doesn't care about the "visual", but it's going to have to pass the dyno test. My PCM is an '8625.

I talked to DynamicEFI in aug/07 about getting one of their EBL systems and he said that EBL would only work on the "C3 series of TBI ECM's" and that it probably wouldn't do what I wanted. (I did buy a complete '8625 from him conveted to drive 4 injectors).

Is it possible to use one for the tests, and a EBL C3 for the "rest of the year"?

Here's a link to some pictures of the 383 going together. You'll also see some picture's of a little 402 w/ a 'vette style doghouse on top. I'm building this little 8,500rpm jewel to go in my "street legal" strait front axle '57 2 dr. I've got a special one-off Mas-Flo SEFI w/ a 80mm Accufab TB for it.

http://img32.imageshack.us/gal.php?g=1212141img.jpg

Thank you-

 

thats one insane intake manifold man!!!

 

this thread makes me wanna do a nasty tbi setp..........

 

So basically there's no way to make power out of a l03? Other than swaping in a 350.

 

https://www.thirdgen.org/forums/tpi/...tpi-310-a.html

 

Does anyone have a part number for the throttle cable bracket that will work with the GM TBI intake? Is there one that is better than the other? Thanks

 

Fast, I finally have my engine built. It's a 355 w/ FT piston, vortec heads, cam specs: 218/224 @ .050 113* LSA .536/.531 (only running 1.5 rockers). I currently have the GMPP intake which I was going to get bored out so I can use the 454 TB. Do you think the GMPP intake will be enough or should I sell it off and get something else before I spend money on machining. I'll be going the '7427 MAF route, so EGR is not important. FWIW I'll prob only be going up to 5500RPM...

 

i plan on using in this swap vortec block with gmpp intake and i am not sure about distributor which one to use.can i use msd 8366?

 

Fast355, thanks for a very informative post I have now marked for future reference. I am new to this forum and was interested in repowering a 3.8 carb with a SBC TPI. I am now bending closer to a TBI setup close to what you are recommending here. I have purchased my crank from Autozone and am now committed to my 89 350 hopefully roller or roller ready block being turned into a 3" stroke long-rod 307 (6.0 Scat-shaved 350 pistons). It was cheap so I figure I saved the money for dollying up the oil holes, cross-drilling and nitriding. Assembled Vortec iron heads are available at my Chev dealer for 630$ Vortec Patriot aluminum 700$ and Raptor Vortec 800$. Was wondering about "tunability" range of the computer being able to make a lower displacement happy, and manifold selection to maximize torque at lower rpm where the 302(basically) will be possibly struggling. I see you used a Victor with an adaptor and was thinking Torker 1 with 1" spacer. I was looking at CC XFI 252 K-kit although a friend has a NOS LS-4 cam. My car is 3400 lbs, I think I can get good performance and better economy with the smaller setup. I'm going to try anyway

 

saving this thread

 

i added those exact shorty headers and went from running a 10.44 with open manifolds to 10.43 with open headers. Should I not be seeing greater gains. Car is bone stock except gears. 89 formula. L03/700R4/3.73 posi

 

Is the wiring harness from the Vortec engine used in the final build or does an aftermarket harness have to be purchased.

 

Sorry, meant to quote the question about smog legal and how to pass. I like to go to the "chain" shops. Their inspectors are less knowledgeable.

 

Fast355, you mentioned upgrading to a TPI fuel pump, I am thinking about using a ACDelco EP377, any thoughts about this pump?

*sorry about bringing back an old thread

 

Is there an alternative to the lt4 cam since it shows as being discontinued everywhere I look?

 

I wanted a similar cam in solid roller for my new-age old school 302 effort and chose a CC 268Magnum solid roller to pair with GMPP Fastburn heads. .525/.525 lift @ 1.5 vs .492/.492 LT4, 224/224 dur @.050 vs 210/228 LT4. Lobe separation 110 vs 112 LT4. GMPP dual plane matching vortec intake, for now. Like Fast355 idea and may switch to GMPP single plane. Mine will be carb first with Demon 650 ... trying to get fuel injection figured out using this thread and some more reading.