well i got an 85 trans am 305 tpi and im running a 15.1 stock and now i got a hooker catback and im planning on getting headers and a cam and lifters and christmas is coming and i need some ideas for some mods im looking for the best solution what do u guys think.

 

aftermarket coil and some good wires.

LT1 intake

 

im not sure if a new cam is really what you need, you already have a somewhat decent one. You should consider switching to the newer ECM and get into prom burning. I havent done it yet, but that will be my next step, that 85' ECM sucks. other than that, upgrade ignition, headers, move battery to rear... stuff like that.What gears you have? got posi? then u should be ready for a cam. Im kind of interested in how you do as i have a relativly stock 85' TPI car as well.

 

First off everyone here is going to say dont bother with the 305 because there is no replacement for displacement. I now have to agree with these people. I have a 305 in my car now that with a few mods runs in the mid to low 14's no problem. I have now ditched the idea of building it up for a 355 so now I am buying parts that will swap over. So with that said if you plan on doing a motor swap I would say buy parts that are going to work on a 350 like headers, cat, cat-back system (3"). Then like stated above new igition system (coil, plugs, wires, cap/rotor, MSD box), if you feel like it gut your MAF (some say it does nothing though), you can do an AFPR, airfoil, and then I would personally dive into the suspension. STB, SFC, LCA's, Panhard Rod, Torque arm, that way when you do get the power you will actually be able to use it and not just go up in smoke.

As far as relocating the battery, dont. It is going to do nothing for you but cause headaches unless you are going to be doing nothing but dragracing. But that is just my opinion. Good luck and happy motoring.

 

what he said

 

Yeah. If u plan on adding a new engine dont bother wasting money. I have a 1985 IROC with a 305 TPI that I am gonna be moding this winter while its in storage. I am going to be getting a 355 or 383 built so Im not gonna waste to much money on the engine, Just get bolt ons and other stuff that u can transfered over. U can get a quick TPI with Headers, Catback, K&N filters along with the gutted MAF and the free mods. Then add on some suspension stuff, and a better Torque converter. Thats should get u to where ur happy.
I have heard about some guys putting the LT1 cam into there 305 TPIs and getting some good results, U can get them used for around $50 bucks. I am pondering this idea, I might go ahead and do it but I havnt heard to much, Im trying to get more info on the topic.
Also look around at other guys cars on here and take a look at what mods they have done to there 305s. Some guys pull some inpressive times with them.

Good luck.

 

Well, like I said in my TPI post, does anyone know the TPS voltage for an '85 Z-28 TPI? I'm stuck with the 305 at least for a while. Thanks, Randy

 

0.54 volts

 

Thanks much!

 

zz4 cam
headers
cat-back
ported head and intake

should net high 13s in a 5 spd

 

too bad you can't use an LT-1 cam in you engine.... the 85' is a non-roller block