JustinZ28

Car is a 1985 Z28, 305 LG4, 4bbl carbed.

So first, lets start off with some tech problems.

My carb needs a rebuild (stock Rochester 4bbl). What kit do you recommend for this?

Also, it's making a high pitch squealing noise form the front of the engine around 2900-3500 rpms. I believe its obviously a belt, but what belt should i look for?


Next to some upgrade ideas.

I'm 100% stock, and i'd like a little more umph out of the engine. I'm looking at doign a full exhaust system, some intake work, and maybe some other small little things.

As for replacing the intake manifold, i saw this: http://www.jegs.com/i/Edelbrock/350/2101/10002/-1

It's cheap, supposedly no modification required, and will just bolt right on. AM i right in assuming this?

Already have my ideas planned out for my exhaust system.

Last thing. I'd like to get a different air cleaner. What is needed to move to an open element air system? As far as relocating the hosing/sensors?

And instead of open element, what about doing a dual snorkel intake system? What would be needed to run that?

jv9999

iTrader: (1)

You can buy a kit for the carb if you're handy or a rebuilt one if you're not. Best to just change all the belts. You could also ditch the electronics and run a conventional carb and ingition. Don't expect much from the intake swap or the air cleaner.

JustinZ28

The intake i wasnt expecting too much form, jsut a little bit. Air cleaner, same thing, wanted it mainly to clean up the engine bay a little (stock one is getting a little tattered)


What are some recommendations on the 305 other than full exhaust to get a good bit of power out of it?

Atilla the Fun

If you have smog testing in your area, use the Edelbrock 3701 instead of the 2101. After exhaust and intake work, the next thing for the engine is a cam. But there are non-engine things you can do for quicker acceleration. Starting with a set of gears in the rear axle. You might have a 3.23:1 gear, but whether you do or not, a 3.73:1 gear would really help. a stock LG4 likes a moderate cam, due to low compression. Something like SummitRacing's K1101. Alot of guys will suggest something wilder.

five7kid

iTrader: (14)

The '85 LG4 has the 9.5:1 CR. The Comp Cams XE series is pretty good. The XE262 would work well with the other modifications being considered. Plan on new valve springs while you're at it.

Exhaust suggestions: Hooker 2055HKR headers; Magnaflow direct-fit cat for the '86-'90 TPI single cat application; whatever cat-back that tickles your fancy for the same application as the cat.

Dual snorkel air cleaner is better than open element. You can make one (see tech articles linked from the thirdgen.org homepage), try to find a used L69 unit (getting more rare and more expensive), or get a set-up from ramairbox.com.

Keep the computer q-jet. It's the best street performance carb system available, regardless of source or price. Secondary rods/hanger change is all the carb will need after a rebuild. A kit you'd get from most any parts store will be fine. An aftermarket 7-pin ignition module and coil (I'm using Accel pieces with no problems for almost 10 years) will help.

These things will make it a completely different car.

naf

iTrader: (7)

Peruse:

https://www.thirdgen.org/forums/carb...tions-lg4.html

JustinZ28

You always offer good help with my questions, preciate it.

As for headers though, Do you recommend anything in the 300-400 range? Trying to keep my full exhaust budget under 1000. May be a little tricky with over half gone on headers/y-pipe. I'd like a free flowing, open system like that though. May just end up goigna little over and getting those.

five7kid

iTrader: (14)

The 2055HKR's include the y-pipe.

Cat for ~$150, cat-back for ~$400 (or less), you'll make budget.

Unless you want to ceramic coat the headers & y-pipe.

Atilla the Fun

No, the '85 LG4 is not 9.5:1. I know the books say so, but it's not so. I've torn down enough to know. It's 8.6:1. And even a cam as mild as Summit's K1102 is too much for an 8.5:1 350, let alone an LG4. a 2400 converter is hell in traffic, so you need a cam that'll like a 2000 stall. a difference of 400 rpm doesn't sound like much, but the behavior is night and day. Far better to have a cam too small than a cam too large. And if you're gonna keep the computer, anything wilder than the 1102 will create problems.