GOT a project 85 t/a 305 fuel injected, tbi, how to go 4bbl setup, or? TPI?

Pull the valve covers and read the castings on the heads - then either search them or repost, and you can get an idea of what those heads are good for (most likely doorstops, considering 80's vintage heads flow like a clogged toilet).

Don't worry about the power levels being lower - if this is a project car as you mentioned, you can always fix those discrepancies with a good set of heads (or porting the ones you have), and correcting the change in camshafts with a better grind.

As for the TPI/TBI/carb debate - for a 305 any of the inductions will work well to give you performance. A carb'ed car will likely have the comp-controlled quadrajet; something you could work with without much effort (or swap on a non-comp carb if you really want to run it well). A TBI unit can perform as well - there's a Holley TBI unit that will support 350 hp, which should tell you that TBI units will more than adequately supply your little 305. TPI units are excellent for street manners and performance on the 305's. My suggestion is to just assess what is given you, stick with that system and tune it for performance - learn what you can from the sources online and from fellow gear heads. When you run into the limit on the 305 (which is around 275 hp or so), you'll be considering a 350 (or better) upgrade, and with that, you can made further intake changes to suit your need for speed and budget.

I'm always an advocate of learning the chops of what you have, then stepping up - most, if not all, of what you learn you'll carry with you.

The reason for the low hp on those cars was that emissions standards were new and so was the technology for meeting them. It was all poorly made and restricted the cars pretty heavily.

I'm not 100% versed in 3rd gens, but the 305 is a good motor...it just doesn't make any power. Also, if I'm not mistaken (someone will probably correct me) there were no 305 TPIs, only 350.

Nevertheless, the conversion is not as simple as switching parts. The 305 and 350 are very different motors and have completely different methods for fuel delivery.

Also, a compression test doesn't really test the ratio as much as it tells you if there's any leaks in the combustion chamber (rings, head gasket, etc).

As for the cam in it, it doesn't really matter on a 305. The difference is like 2 or 3 horsepower. You'd never notice it, especially in a 24 year old car.

If the intake is off of it, a TBI would require a computer if I'm not mistaken. If there's no computer in there, then you'll be looking at carbs.

In any case, it's a project right? You could probably get a 350 setup off the internet somewhere complete with computer, injectors, etc..."ready to run" as they say. I've seen some out there on like jegs or summit for maybe 2000 or less? I'd have to double check, but you seem eager to learn and those are two of the best places to get performance parts for a GM car imo.

Anyway, good luck with your project. I hope it brings you as much joy as my cars do :)

Alright, you'll find a different bolt pattern on a TBI manifold and i also believe on the TPI manifold. The four center bolts on a carbed manifold enter the heads at a 45 degree angle, on your EFI manifolds the two center bolts will enter at a 90 degree angle so you'll have to buy a new manifold or modify the old ones by reaming the holes with a drill if you plan to make the swap. As far as electronics and wiring goes, you'll need to get a wiring harness, (fuel pump?) ECM and all of the sensors of your fuel injection system. Instillation will be time consuming, but will be easy if you can read and follow wiring diagrams. As far as your ignition system goes, you can take two routes. You can take the ignition module, distributor, and knock sensor from an EFI engine or you can use a mechanical/vacuum advance unit and cut out alot of the hassle. If you leave the engine alone internally, you should be able to use the stock ECM without having any flashing or tuning done. It's a big project but it's your car and you have to do what you want. Another route you may consider taking is using if you have the money is using an aftermarket fuel injection system like FAST or Holley. They make easy to install self learning systems that are hassle free and tune themselves. Do your homework, thirdgen.org is very helpful for projects like this!

Won't work,tuned port injection requires a computer.You would have to revamp the whole system,would cost too much.If you want more horse power,up grade to after market intake and a good 4 bbl carb with free flowing exhaust.Get the vin number and find the id number off the motor to see what version it is.You can go to library to check a chilton or call your local pontiac/gm dealer,parts counter can tell you specs of motor.

Sorry to say but the 305 and 307's from that era were smog motors with all most no horse power.You could install a 403 or 400 with matching trans to make it go like it looks.

to much work involved. Just because tpi has more hp dont mean you will get that hp. Your car was not designed for it and you will have problems. Leave it alone

tpi fuel injected 1988 camaro