Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

305 to 350 Engine Swap

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Old Nov 11, 2005 | 11:09 PM
  #1  
rads84n94camaro's Avatar
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From: Flemington NJ
Car: 94 Camaro RS. 84 Z28 350 T5
Engine: V6 & V8
Transmission: Automatic & Manual
305 to 350 Engine Swap

Wuts up all

so i just bought another camaro 1984 z28 and ive decided to take out my 305 and drop in a 350 crate motor, and suggestions to go along with this? Am i gunna need 2 get a new tranny or rear. instead of shelling out a whole ton of money i was gunna take my 305 intake manifold and carburetor and put it on the 350 until i get more money to do up the rest. will this cause any problems internally. Im sure it will restrict the engine to its fully potential but im not too concerned about hp just yet i just want 2 get it on the road. Then once i get the money i want 2 upgrade to a better intake and carburetor
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Old Nov 12, 2005 | 01:02 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The carb is the last thing, power-wise, that needs to be updated. The intake is the 2nd to the last thing.

Exhaust is the biggie. Then air cleaner. Both restrict the 305, let alone a 350.

Beyond that, the 350 in place of the 305 longblock is a simple change, and benefits-rich. Just did it this past summer myself.
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Old Nov 14, 2005 | 09:10 AM
  #3  
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From: Flemington NJ
Car: 94 Camaro RS. 84 Z28 350 T5
Engine: V6 & V8
Transmission: Automatic & Manual
da mn u put some good money into ur car. and man i love the 2nd generation camaros they look good. Thanks for the info and im actually probably going 2 build my own 3 inch exhaust for this car coming out the sides right before the rear tires. haha
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Old Nov 14, 2005 | 02:14 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally posted by rads84n94camaro
u put some good money into ur car.
Average of about $800/yr for 6 years.

and man i love the 2nd generation camaros they look good.
I was in high school when they came out. Hated them then, still don't like them much now.

3" duals typically aren't needed with a 350, especially one regularly driven on the street. They don't do much for ground clearance, and a single 3" run down the stock location is typically more than adequate. It will also usually cost more to fabricate than a pre-fabricated, bolt-on aftermarket system would run you.
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Old Nov 14, 2005 | 05:07 PM
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From: Russell,Ontario,Canada
Car: 84 Z28
Engine: Modded 350ci.
Transmission: T-56
A 305 to 350 swap is simple...Make sure you mark all your wires though...otherwise it will be fun trying to figure out what everything goes to again..

I'm doin a similar swap this winter..but my 350 has none of the computer controlled/monitored parts on it that my L69 did..
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Old Nov 14, 2005 | 06:31 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally posted by Zedsled
..but my 350 has none of the computer controlled/monitored parts on it that my L69 did..
Why not???
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Old Nov 14, 2005 | 06:34 PM
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From: Russell,Ontario,Canada
Car: 84 Z28
Engine: Modded 350ci.
Transmission: T-56
I'm running a different distributer,intake,carb and non-emission friendly headers/exhaust.

there are still the wires to the sensors for temp's,pressure's and RPM.
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Old Nov 14, 2005 | 06:43 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
With manual tranny, I can see that. But, with auto tranny, keep the computer controlled stuff for a primarily street-driven car.
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Old Nov 15, 2005 | 04:04 PM
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From: Russell,Ontario,Canada
Car: 84 Z28
Engine: Modded 350ci.
Transmission: T-56
I'd rather not run a computer programmed for the 305 on my 350...besides i'm converting it to a manual tranny this winter.

Besides..as far as i can tell the computer controlled the distributer,air fuel mixture on the carb and what the A.I.R pump were doing..and since i've changed all those parts or taken them off the car..there's no where to plug the wires into.
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Old Nov 15, 2005 | 06:21 PM
  #10  
rads84n94camaro's Avatar
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From: Flemington NJ
Car: 94 Camaro RS. 84 Z28 350 T5
Engine: V6 & V8
Transmission: Automatic & Manual
Aite sweet so it wouldnt b too hard 2 convert a 305 to a 350. Next question wut about converting my 305 carbureated V8 to a 350 crate motor fuel injected?
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Old Nov 15, 2005 | 06:23 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You mean like a 350 Ram Jet?

Do you have emissions "issues" to comply with?
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Old Nov 16, 2005 | 06:04 PM
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From: Evansville, Wisconsin
Car: 91' Pontiac Firebird
Engine: LT1
Transmission: 4L60E
If you are planning on using the multiport injection, you will need a high pressure fuel pump, computer, sensors, wireing, high pressure rubber fuel lines, fuelpressure regulator, possibly a new distributer depending on what system you are going to use, ect...

well that should be enough to get you started
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Old Nov 17, 2005 | 09:46 AM
  #13  
rads84n94camaro's Avatar
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From: Flemington NJ
Car: 94 Camaro RS. 84 Z28 350 T5
Engine: V6 & V8
Transmission: Automatic & Manual
Yea i do have emissions issues, and especially living in new jersey its gunna b real hard. So i was thinking about whether itd b a big deal 2 convert a 350 to fuel injection without paying huge expeneses. Any suggestions on how i can do this, or even if u think its better to just stick with carburetor wut are some ways to make sure i can get a 350 crate motor threw inspection without any problems
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Old Nov 17, 2005 | 09:55 AM
  #14  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
If you want to drop in an injected crate motor, your chassis will have to be '75-earlier, as none that are available are emissions-legal, to the best of my knowledge.

If you want to drop in a crate motor and put fuel injection on it, it will have to be an emissions legal type if fuel injection. Those are limited to TBI, TPI, LT1 and LS1. If you go for LT1 or LS1, you will have to get an LT1 or LS1 crate motor.

The simplist route is to put a Gen I type crate motor under your current carb and keep all of the emissions and control equipment intact. If NJ follows strict visual inspection guidelines, you will have to have a catalytic converter in the factory position, which pretty much rules out dual exhaust (unless you do dual cats in the stock location, and keep dual pipes after the cats - expensive, will probably negatively affect ground clearance, probably won't improve power over a single 3" bolt-on system).

My car will be emissions exempt after next year (with 5-year collector plates, which I can get with my current emissions test certificate). Otherwise, I could easily have done exactly what I said in the paragraph above.
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Old Nov 17, 2005 | 10:06 AM
  #15  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally posted by Zedsled
I'd rather not run a computer programmed for the 305 on my 350...
For the sake of completeness, let me add that carb programming is not all that displacement sensitive. You can get into issues with carb circuit tuning with displacements over 350, such as a 383 or 400, but the PROM programming itself is not an issue. You can get into details such as EGR delete (done on the HO 350 Camaro Conversion Kit using the ZZ4 crate engine from the factory - no longer available, by the way, but the PROM is), ignition advance curves, and the like, but the basic 305 programming is quite adequate for the typical 350 crate engine. Where you can get into trouble is with cam changes that get you into overlap territory that starts confusing the O2 sensor at idle.
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Old Nov 17, 2005 | 05:52 PM
  #16  
Zedsled's Avatar
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From: Russell,Ontario,Canada
Car: 84 Z28
Engine: Modded 350ci.
Transmission: T-56
The car is an 84,so there were very few sensors on the car as it is..When i took the exhaust off there wasnt an o2 sensor to be found.As i'm on Ontario,our emissions check end at the car being 20 years old,so thats one less thing i have to worry about.

The engine has many performance mods done to it...I'd rather not run a computer on my car..i prefer to have control over what the engine is doing rather than a computer choosing the spark timing,air fuel mixtures(within it's limits).It's also much easier for me to tune the carb this way..i can change my metering rods and such to have it re-act the way I want it to..not the way GM wanted it to when the produced it.
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Old Nov 18, 2005 | 10:59 AM
  #17  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I was thinking about rads' situation, not yours, and didn't want what you said about 305 computer running a 350 to be taken by others as something to be concerned about. Your Canadian situation is much different that what at least 50% of us Yanks have to deal with.

FWIW, it could be argued that you have better control over engine parameters with feedback computer controls (if you can get into the BIN) than you can possibly have with open loop mechanical controls.
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Old Nov 18, 2005 | 04:28 PM
  #18  
Zedsled's Avatar
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From: Russell,Ontario,Canada
Car: 84 Z28
Engine: Modded 350ci.
Transmission: T-56
I was under the impression that,that post was directed at me because you had quoted my post.

I realise that computer controlled cars are much more tunable thus re-acting better to all weather climates with a quick re-tune...Unfortunatly everybody i know thats Fuel injected has to bring their lap top with them out on friday nights and re-tune to make sure they are running properly.I'm happy with a general tune and the car running stronger some nights than other nights.
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