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Old 04-24-2003, 08:01 PM
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Post "spicing" up a 305

i have a stock 305 lg4 in my el camino the stock figures are 165hp and 240 ft lbs. the only mods are a cam from a 3/4 ton truck. what would be anybody recommendations on modding i.e. intake/exhaust and so forth

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Old 04-24-2003, 11:26 PM
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headers, low restriction exhaust system with use of turbo or flowmaster mufflers with a balance pipe installed, a hotter ignition coil and module if your HEI isn`t computer controlled, spiral core plug wires, a K & N air filter. almost all LG4 engines suffered from lack of fuel, the stock pump can`t keep up with the demands in most cases, I`d replace it with a carter unit or the like. get a matched set of 1.5 rocker arms, add a Edelbrock performer intake or weiand action plus. These mods will help make your 305 a respectable driver with better MPG.
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Old 04-25-2003, 09:46 AM
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a fuel pump would actually help?
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Old 04-25-2003, 04:11 PM
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many have written into the tech section of Chevy high performance magazine, they say there LG4 cough`s and sputters or acts like it`s choking to death. the response has been the same to each one, the fuel pumps that came with LG4`s can barely keep up with the stock demand for fuel, much less a performance engine so a replacement was called for, in your case you may think it`s not important, but if the fuel volume isn`t there, or it`s just barely enough to keep the car running on a fuel throttle blast and it goes lean and melts a few pistons or does considerable amounts of damage elsewhere you`ll see what I mean. in any application if the fuel isn`t there or not enough of it, bad things happen.
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Old 04-25-2003, 05:33 PM
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I had the LG4, I did a lot of bolt ons....carb,intake,exhaust,air cleaner,rear end,shift kit,flamethrower HEI,aluminum water pump etc.... Most bolt ons to the LG4 are not noticeable, seriously. I wish I would of done the fuel pump, to see what would happen.
Exhaust is the BIGGEST. If ya can..get rid of the convertor, put on headers and a good muffler, that is the ticket. I put on the headers to a cherry bomb. It was loud but a gain of around 40 hp! No BS. The hot coil and module made no difference.
The springs in the distributor are HUGE with the little torky 305, very noticable and cheap
($5 at most), switch to the most flexible, I believe they are the silver springs. Those are noticable mods.
Also a HUGE mod was my 3:73 posi gear swap! That was around 37% more torque or acceleration. BUT the rpm`s were so damn high I destroyed my main bearings. And now I`m working on my 350. So my best advice ( my wallet proves it ) do the exhaust and the springs and leave it alone!!! The good thing about the mods to a 305...most of the mods will go to my 350. So I did not lose.
Good luck ..any questions KBlachura@cfl.rr.com
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Old 04-26-2003, 02:53 PM
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what i was thinking was getting the performer intake only like $170 thats good for apprx 15hp and then i was gonna get the entire exhaust worked over like Hooker headers/duel 3"/flow master 40's. but since you say the fuel pump is a big issue than im gonna have to look into it
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Old 04-26-2003, 07:14 PM
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WOW.....Did you read my last? Re-read it.

You won`t feel 15 HP with that intake on your 305. I thought I was going to also. Trust me.

A fuel pump is cheap as hell, try it out. Then re-read what I wrote!!!
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Old 04-26-2003, 07:47 PM
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i read what you had to say but im on a budget of hardly anything and i cant afford to go out and buy $600 of exhaust.
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Old 04-26-2003, 09:43 PM
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You would probably do just as well to port match the manifold and heads than to put money into a manifold for that thing.
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Old 04-27-2003, 02:55 PM
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when your talking about porting, what is it? and how efficient is it to have them matched
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Old 04-01-2006, 08:41 PM
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83montecarlo

i have a stock 305 LG4(year=1983), and i have a K&N filter on it. it has no balls . and i was gonna put on a 600cfm carb and an intake manifold. but i read that the fuel pump doesnt supply enough gas, is that true for my car? also do u think that if i did do the carb and intake would it give my car enough balls to squel the tires? i would also like some recommendations on wat to do with my engine to give it some balls.
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Old 04-01-2006, 11:51 PM
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the .040 over 305 in my 79 Malibu has a Lunati torque cam, Power Plus dual plane intake, 750cfm Quadrajet, Dynomax headers, 2 1/2" dual exhaust and it putting just over 250hp to the wheels. it suits me just fine.
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Old 04-02-2006, 03:28 PM
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i want to get decent gas milage thats y i dont want to put on a 750 carb. is it on the 83, 305 engine that the gas pump isnt giving the engine enough gas, or is it for the newer 305's?
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Old 04-02-2006, 04:40 PM
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Doc here,

How much is your budget..Is what you need to look at..

Limited funding?

Go with better breathing , higher volume Fuel pump, New Module, plugs , wires, Cap , Change the Epoxy Coil out for an Oil filled one..Rebuild the Q~Jet..And tune it to precision (takes about a day to do it right unless you've done 20 or so..) Headers, low flow exhaust, Cool air intake and K&N filters..

You should be able to bring it in under a Grand if you do the work yourself..

If you have about 8 grand to spend..you can build this..



This is a 305 I replaced a 350 with in my Daily Driver Vette..

On a GOOD day..It will produce 275 HP...has some reasonable heart..and can hold it's own against a mild 350..

The reason for the step backwards was to go from a flat 6 MPG (Old worn, Carbbed 350), to 15 MPG when fuel was headed towards $3.50 a gallon..and still be able to have some heart..

It will light the tires..It will even break them loose Between Low and intermediate on a wet day If your not careful..It CAN beat the muni Busses off the line..and outrun a standard Taxi Cab in the 1/4 mile..

Since the Vette IS driven Daily..and a fill at the height of the gas crunch, before prices came down, was $100.00 (twice a week..)

So..How much are you willing to Invest? That's the question you need to be asking yourself at this point..

It's the 4 "T" 's rule..
  • Time
  • Tools
  • Talent
  • Treasury

Add up which you have the most of and that wall predicate your Build direction..

Doc
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Old 04-02-2006, 06:25 PM
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I always thought of the 305 as just a commuter engine, and not really being able to perform very well (300hp at most). But reading this has changed my mind. I can live with the 305 in my El Camino, its a decent engine, but if I want to go faster, I'll just go with a 350. Because I have a few projects going on, and not alot of money, I can't afford to build a Performance/Economey engine in something thats not driven daily, its just not practical.

The 305 is a decent little engine, but just not much for a Hot-Rod. (unless your going into the "Rat" or "Jalopy" kind of thing, where you throw together a bunch of junk and drive it till it burns to the ground from a wiring harness made of speaker-wire.)

I have heard people talk about putting all these exotic parts into Supercharged, bored, and stroked 305's before, but then again, whats the point? I "dare to be different" alot, but If your going through that much trouble, why not just do that stuff to lets say, a Buick 350 (actually 340 inches) or an Olds 307? You don't see many of those, and what would make more of a statement than an '84 Camaro with Buick power ? Even if its in the most generic sports car ever made, you would have to appreciate going against the grain that much.

Just don't go any crazier than bolt-ons, that way you could move-up some inches in the future.

-GF
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