Just like it reads. What mods to create more power from a 350 tbi.

What are your suggestions to do with out dropping thousands for dollars?

Cams

Different fuel injectors

What works?

Kole

There are many mods that can be done, some of the mods are cheap, but won't help you until you've already changed the cam and installed some headers. Read the following article and you will learn tons about the TBI Chevy motors.

http://tbichips.com/truckmods.htm

Dont mess with the spacers or cheap chips on ebay. If you want power get good headers, good intake and cam, and vortec heads. Then go to tbi chips for the tune.

Dont mess with the spacers or cheap chips on ebay. If you want power get good headers, good intake and cam, and vortec heads. Then go to tbi chips for the tune.

Why not do spacers? TBIs are the only thing they really work on, I'm running a TB spacer and a Pod spacer. Do the ultimate TBI mods, headers, an intake with an adapter, and Vortecs really are a good idea.

The pod spacers work well for a few hp but the dyno will show no real gains from the under tbi spacers.

At school we had a chassis dyno and a tbi caprice that was a test mule for mods.

and Vortecs really are a good idea.

It depends on where you want your power. Vortec heads for higher rpm power and cleaned up TBI heads for low rpm TQ production. The TBI heads actually flow better than Vortecs during the low valve lifts (valve opening) and under 3500-4000 rpm's....lots of good info on 3rd gen.

Solid roller cam and some heads that flow close to 290. Port match the intake and heads.

Solid roller cam and some heads that flow close to 290. Port match the intake and heads.

Solid roller? Not if he has a knock sensor.

some heads that flow close to 290. Port match the intake and heads.

and....where is he looking to make power? Port match is good for HP and TQ production.

Port match the intake and heads.

^^^ This. also, since you're in there with a stone, polish the ports.
be sure to clean the ports very well!

how much can you do with a cali truck i know they need carb numbers for everything you put on it ..... what can be done? my dad said he might give me his 1990 chevy 3/4 ton and the SBC is tired maybe a rebuild but really dont know what i can put in it to make some power. oh and will any of this give me some better MPG?

^^^ This. also, since you're in there with a stone, polish the ports.
be sure to clean the ports very well!

Not the intakes, polish the exhaust. Clean up the swirlports and they'll do fine given the rest of this motors/application limitations.

to the OP, if you're thinking about a rebuild you mine as well stroke it out to a 383 (it is NOT much more $). It will not take much tuning if you keep the cam close to stock (but improved) and you could most likely get away with just increasing the fuel pressurem (which in turn increases the lbs/hr flow rate). The OEM can support a 383.....and a 400, if you keep the camming within limits. If you go more wild, then you'll need more aggressive tuning (datalogged, not just a generic burn), fuel pressure, and larger injectors. Keep it mild and build for TQ.....I love TQ. Besides HP is a byproduct of TQ.... :D


EDIT: Oh, and I am pretty sure you could sneak a 383 through your vehicle inspections. They don't measure stroke do they? :) Nothing on the outside will be obvious, and it'll still sniff clean. Maybe increase the fuel press after the inspections, let it run a bit lean....they do anyway from the OEM.

Thanks for all the tech help. Very cool.

Here is what I have. A 92 yj, Dana 60's, 40 iroks, leaf sprung trail rig.

I don’t drive on the road very often, to worried about police. If we do drive it local not over 110km's.

Engine is stock mated to a sm465. Would like to go automatic some day, but I am a daddy with another on the way. It ant happening. $$$ and money

I do have a silly spacer and an aftermarket hood and air filter. On of the large tube hoods and cone filters.

I would like more power of the line starting from low idle. I have very low gearing for crawling. I am not worried about high hp. the rig is not meant for fast running. Or high rpm. That brings me to another (Q) rev limiters.

I used a stand alone harness from AFI and a chip that removed a bunch of stuff.

I have been wondering about heads but they are $$$$ was wondering if a set of 5.7 cast or alums from the wreckers would make a big diff.??

Was planning a cam and headers. What should one use?
Does the header differ between vortec and non vortec?
You mention intake, are you referring to manifold?
Lots of Q's what do you guys think?

Kole

I don't know why I was thinking you were in Cali and had to meet the sniffer....anyho'

I would stick with the 193 swirlports you have now (heads) they are better than Vortecs at low RPM's and off the line TQ...that is what they were designed for from the start. Again, lots of info on this debate over on ThirdGen. You'll keep TQ production up and mileage (may not be a concern). A mild cam could help, call any of the cam companies and they can dial you in....if the tech guy on the other end of the line knows what he's doing. I'd suggest if at all possible to swap to a roller cam, you can get "more cam" (valve lift and quicker valve opening) while maintaining a decent computer friendly duration...which willproduce TQ off the line.

Headers for low RPM?? I'd stick with cast manifolds or these (as I personally don't see the gains with headers):

http://www.speedwaymotors.com/25-Inch-Corvette-Style-Exhaust-Manifolds,9133.html

Or these:

http://www.speedwaymotors.com/Small-Block-Chevy-Cast-Iron-Ram-Exhaust-Manifolds,3823.html

I built a 383 for my 90 chevy which passed emmisions easily. I ran the stock tune, headers, injector spacer, k&n filter, ported heads, edlebrock intake, and a mild full roller cam and rockers. Ran great, had 3.73's and 33's, average milage on the highway 17 in town 14-15.:smokin: I would advise against keith black claimer series-skirt breaks on these, but speed pro coated pistons are good.

first start but open air filter, headders ehxaust
cam 272 is the biggest ive been told for a tbi set up with out idle problems
holley thottle body. bigger inlets and injectors for the pice its a better set up then jsut buying injectors
heads are the biggest thing. port match port polish and valve job.

biggest thing is a tune!!!!

you could build a 383 but the one piece crank runs about 200$ and then it requires a piston change with a shorter skirt and some clearence
hp sells the motor tq wins races

first start but open air filter, headders ehxaust
cam 272 is the biggest ive been told for a tbi set up with out idle problems
holley thottle body. bigger inlets and injectors for the pice its a better set up then jsut buying injectors
heads are the biggest thing. port match port polish and valve job.

biggest thing is a tune!!!!

you could build a 383 but the one piece crank runs about 200$ and then it requires a piston change with a shorter skirt and some clearence
hp sells the motor tq wins races

Do not buy the holley TB pain in the ass to tune and don't run for shit. Buy a bored out unit from XtremeFI and run that. Also saves you a few hundred bucks.