CamaroRS

I was wondering what the best mods for an 87 camaro with a 305 LG4 mated with a 5 speed would be? (ie exhaust, ignition, heads, intake manifold, new carb) Thanks

Ray87Z

Headers and a full exhaust to start with, then a mild cam swap accompanied by an aftermarket intake and some carb tweaking and/or a non-comp controlled carb and distrib. You can make 250 ish hp easy w/ the stock heads and bottom end on the LG4. Check out www.inter-scape.com/ray/305buildup.htm for scan of mag article on a buildup of the LG4. They start out fairly simple and work their way up to 325hp (with vortec heads, hot cam, etc.)...


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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

SUPER-SPORT-CHEVY

Let me get this out of the way
"the best mod for an lg4 is the dumpster"
J/K

Well im glad to see that someone else is working with what they have insead of going the 350 route.
The best mods from experiance for an lg4 are flat top pistons, a mild 212ish-224@.50 cam and ported&polished heads. these mods will make an lg4 seem like theres an extra engine bolted under the back seat.

dsmanimal

How about this combo for mid to high 13s on stock tires:

1 5/8" headers, 2.5" dual exhaust with crossover pipe, high volume mechanical fuel pump, Holley 144 ci mini roots blower running 7 psi of boost, Mallory dual point distributor, Holley 650 cfm double pump carb.

Big454blockchevy

The best mods in my opinion would be an aftermarket intake(edelbrock) and exhaust. Later when you get a 350 go with aluminum heads,ingition upgrade and a 750 (Holley) carb.

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Big 454 72 Chevy Nova
383 86 Camaro Z28
10.5:1compression 186 casting Heads,234dur.488lift exh&int,Edelbrock performer intake, Holley750 vac.sec 400 crank,flat top pistons,edelbrock valve springs and lifters,tranny shift kit,2500 stall converter. Will install 3.73's later on and might go with a more aggresive cam.As of 4/01 added Hooker Headers,2.5inchpipes with 40 s. Flowmasters.Ignition upgrade include: MSD Coil and MSD module.

jayman350

If you are gonna change the intake I say go for the Edelbrock Performer RPM. I read an article that said that they got 15-20 more HP out of the RPM than the regular performer. If you do replace the intake make sure you buy the 1 1/4" drop base that comes available in most styles of open element air cleaners. I wouldn't stay with the q-junk carb, upgrade to a Holley (600-650) I have seen them on ebay for pretty cheap, then you invest $20 in a rebuild kit and you are good to go. Then you can dump all of the pollution stuff(if you haven't already) and your car will be able to breathe much better. I was planning on this exact method until my stupid engine decided to start making all sorts of sounds and running like ****. Oh well, looking at a 350 tomorrow <fingers crossed>


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Jay

black 85 Z28, t-tops, 4bbl carb, flowmaster 80 series muffler w/ custom tips (hollowed out cat), edelbrock chrome air cleaner, Infinity 4" 2 way front speakers and Infinity 3 way 6x9s, Alpine CDA-7863 head unit. many more mods planned (holley carb 4160 and edelbrock performer RPM intake coming very soon)
Jay's webpage

84TransAm

It is definently refreshing to see someone who might build up the LG4. No dumpster needed I'm just doing basic bolt-ons. I already have the Holley 600 on, made a very noticeable torque, throttle response difference. Next comes headers, intake (Performer for emissions purposes). Then around July or so when I pull the Engine (to change the oil pan) I'm going to drop in Comp Camshaft 262XE. Buildup is equal to about 250-260 hp, and well over 300 lbs of torque.

If you have the Borg Warner 5 speed, 310 lbs of torque is about it's limit, so you may want to look into either a stronger transmission or a quality rebuild beyond that.

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--Steve S--
1984 Trans Am 305 LG4, 5 speed Daily Driver, Flowmaster 80 Series
Holley 600 cfm & vacuum advance Soon: Edlebrock Intake & TES

EvilCartman

iTrader: (1)

I've been building up mine slowly... 256XE, performer intake, headers, 3in exhaust, spintech muffler. Next thing on the list is a Holley and new distributor, just haven't gotten the money up for it yet. Much later on, possibly a set of heads

Update: Well, I've just swapped in a vacuum advance distributor and Q-jet from my dad's truck that has a 454. My car runs great now other than having to swap out the secondary's metering rods and hanger. Before, since I've got computer problems, it used to belch black smoke from running full rich. It's like driving a different car now

[This message has been edited by EvilCartman (edited April 29, 2001).]

jbenge

iTrader: (2)

Theres nothing wrong with gradually building up a 305. Thats what I've done since I'm in college and haven't had a lot of money to dump into a 350 all at once. I've been able to get my stock bottom end LG4 to run a 13.4 quarer mile so you can make them run decent with the right selection of parts. If your car is a daily driver you would probably want a more mild combination than my car, check my signature for mods.
I would start with 3in exhaust, carb, intake, and headers. If you want to go further then consider a cam swap, and head work.

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best 1/4 mile so far: 13.4 @ 101mph

84 Camaro 305 ported & milled heads, 3 angle valve job, Edelbrock Performer RPM intake, Hedman full length headers, Accell ignition, Crane 274H cam, B&M 700R-4, 3000 stall speed, 4.10 gear,
M/T ET street tires
visit my website at http://www.geocities.com/jbenge/page1.html

MikeDwhoROCZImports

iTrader: (1)

I've got the LG-4 on my 87 IROC. I'm a poor college kid, and don't have a lot of money to play with, but I've done a couple mods. I thought the biggest improvement was a dual snorkle intake, free flow catco cat, and hooker 3" mandrel bent cat back exhaust. It dropped over a second in my 1/4 time, and my car pulls strong right up to 5,500rpm (odd, considering this car has the "peanut cam". It really pulls that long too. I swear it'd go harder but I don't want to rev it any more than that. Before it would start to die off at 3,750rpm)

I waiting for headers, heads, etc. when I do my TPI swap...

Aaron87SC

If you can get at that cam, get rid of it. A free flowing exhaust and intake can't do all they can for you with that cam choking the engine.

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1987 Camaro Sport Coupe LG4
700R4 with 2.73 open rear
Hypertech chip, 180* stat
L69 Dual snorkel air cleaner with K&N air filter
CK rods with B hanger
Hooker catback
Pioneer DEH-P4000, Pioneer speakers front/back

paul_huryk

Check out the tech articles section, I wrote an article that features mods to the LG4. I can't remember what the title of thew article is (old age setting in), but its there.

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Paul Huryk, billionare in training.
Monkey Guy Racing
Almost part of the moderately infamous NJ in-your-face all goomba crew

Do it right the first time.

Paul's home page

1985 IROC LG4 POS Best: 15.20s at 92.1mph
1984 Camaro 350 LG4 Best: 12.21s at 121.7mph

The smart person pays for something today so that more is received tomorrow.
The ignorant person gets something today and hopes to have enough money to pay for it tomorrow.

Bort62

Well, Im having good sucess with My Modded LG4 bottom end.

I suspect that with Headers, and Some traction, I should be into the 13's.

I hope to Run a 14.5 ish This weekend at bakersfeild




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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver
Reader's ride -&gt; My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

five7kid

iTrader: (14)

For an '87, the main restrictions are in the exhaust, cam, and air cleaner. The heads aren't that great, but until/unless you fix the other things, changing heads isn't necessary. But, exhaust and air cleaner alone WILL make a difference, even if nothing else is done. The good news is you already have a good compression ratio.

I personally think carb and intake changes are a waste of money, especially if you have to go through emissions inspeciton/testing. A Performer or Action + is slightly better than stock, but, you have to make other improvements before you'll get gains out of a manifold change. And, if otherwise operating correctly, a carb change is an absolute waste of money, especially since you have to change distributor and EGR valve as well. However, if emissions is a consideration, you can't do the carb change, anyway.

My sig tells you what I've got going.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlock header mufflers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere w/open diff & slipping tranny.

Ray87Z

A Performer intake is worth 20 hp and 20-25 ft-lbs over the stock intake on a LG4 w/ good headers as the only mod as per the article link I posted above. The Perf RPM is worth another 15 hp over the Performer on the same engine. Again that is a LG4 w/ just headers, stock cam and heads.

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

super83Z

Actually i am helping a friend do a carb,intake and distributor swap in his 82Z tomorrow night!

just in case he's reading what's up Franz!

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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28 350w/ edelbrock performer RPM power package with 64cc aluminum heads, dynomax shorty headers, 700R-4 with shift kit, 750cfm carb, edelbrock 3" exhaust system, ASCD SS hood, 16" IROC rims.

future mods:
completely done over suspension, black paint with flames, Hurst shifter, dakota digital gauge package, procharger supercharger.

ramrod85

test

85305ta

hey you want some help with that Q-jet one thing you can do to boost your accel time and a little more high end power is, loosen the spring on your secondaries there is a set screw on the pass side of your carb underneith the secondaries now if you are unsure about this don't do it, it is tricky and really could use a friend this will remove tension on the upper butterfly valves tools needed is a torx on allen wrench and a small slotted screwdriver this is a very cheap mod and has improved my org. carb NOTE**** "when you lossen the set screw you must have a screwdriver on the spring tension screw and be holding it so the spring dosen't unwind" the tension screw is located right above the set screw on the side of the carb. you just want to lossen it enough so that when the sec. are about 1/4 way open the spring pulls them closed let me know how you make out. (i have lots of mods you can do cheap or nothing at all just a little time is all you need)

84TransAm

I've heard guys on the Monte Carlo SS message board talking about the ZZ4 intake being equal to the Edelbrock Performer RPM intake. Dunno if it's true, but it costs around $80 and is emissions legal with a port for EGR.

camaro86

which cam produces more hp on a mostly stock and daily driver Lg4?

EvilCartman

iTrader: (1)

Damn this is old

camaro86

yup very old

five7kid

iTrader: (14)

Yup, so old it has my old sig in it.

Best cam for a mostly stock daily driven LG4 is the one that is in it. Until you improve the exhaust and air cleaner, it doesn't make any sense to put a different cam in it.

camaro86

oh ok i will get the exhaust and the aircleaner

net_coma

iTrader: (3)

Take a look on montecarloss.com, the Monte drivers never had the option of fuel injection. There is some good info there on working with the 305 to improve performance and there is a lot of focus on performance and emissions (leagle). When you guys remove the emissions hardware it may be a good idea to hang onto it and remove the computer harness in complete and good condition. You may not have a sniff test now but may in the future. Another reason is that should you wish to sell the car at some point in the future the potential buyer may need it and the tossed junk may cost you a good sale.

http://www.montecarloss.com/technical.html

and if ya just gota do it to show the guys it can be done this link it so a Hot Rod Magazine build up of a 305 making 400HP.

http://www.hioutput.com/tech/400hp/400hp.html

But...I agree strongly ponder the 350 swap before sinking cash into more than the bolt on hardware.

camaro86

which hedders performer best for the LG4 ?

five7kid

iTrader: (14)

Ones that aren't made for an LG4.

Details on the Exhaust forum.