305 to 350 swap completed!!
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Car: 1991 RS
Engine: 350 TBI
Transmission: 700r4
Axle/Gears: 3.08 lt. slip
305 to 350 swap completed!!
With the help of the information I read on this board I swapped out my 305 for a 350 in my 1991 RS. I purchased a 1992 caprice 9C1 former cook county forest preserve K-9 car with 69000 original miles. I removed the motors from both cars and put the 350 in the Camaro and I will be putting the 305 back in the caprice in order to sell it. There was very little differences with both motors as they are both TBI. I swapped the ECM's a couple of sensors and that was it! The 350 runs great with no check engine lights or codes thrown. Although the 350 is stock there is a noticable difference in the way the car drives and performs which has made the swap worthwile.
Thanks again to all that post here! Reading various posts made this swap go very smoothly.
Thanks again to all that post here! Reading various posts made this swap go very smoothly.
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Car: 86Z/92 RS Camaro
Engine: 357 vortec finished. need tuning
Transmission: Still works
Axle/Gears: need 3.73
Re: 305 to 350 swap completed!!
Congrats on the swap. when you put the 350 into your RS, did you take the t-converter as well?
#3
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Car: 1992 Chevy Camaro RS
Engine: 305ci TBI
Transmission: 700R4 Auto w/ OD
Axle/Gears: 2.73
Re: 305 to 350 swap completed!!
Any tips with the swap? I am contemplating whether to do a 350 tbi or 350 tpi swap.... Whichever is cheaper and easier (limited on both cash and time). My old 305 is getting tired, and its about time to put her to rest..... Did you have to do any extra wiring with the ECM swap?
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Car: 88 Camaro SC
Engine: Aluminum Vortec headed 383 roller
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt/3.27
Re: 305 to 350 swap completed!!
You could swap from the 305 to a 350 TPI engine while keeping your TBI system which would make the swap much simpler with minimal headaches.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 305 to 350 swap completed!!
I purchased a 1992 caprice 9C1 former cook county forest preserve K-9 car with 69000 original miles. The 350 runs great with no check engine lights or codes thrown. Although the 350 is stock there is a noticable difference in the way the car drives and performs which has made the swap worthwile.
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Car: 1991 RS
Engine: 350 TBI
Transmission: 700r4
Axle/Gears: 3.08 lt. slip
Re: 305 to 350 swap completed!!
Checked compression, timing chain, etc. Replaced all of the tin gaskets motor runs strong. Biggest hurt was car sitting for severakl years undriven.
#7
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Car: 89 chevy camaro rs
Engine: Tbi 305
Transmission: 700r4
Axle/Gears: 3:73s
Re: 305 to 350 swap completed!!
Thats good to hear i was going to do the same however i didnt think the 20hp increase from the lo3 to lo5 would be worth it? You may have changed my mind.
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Car: 1991 RS
Engine: 350 TBI
Transmission: 700r4
Axle/Gears: 3.08 lt. slip
Re: 305 to 350 swap completed!!
THe stock 305 in my Rs was 170 HP the Stock 9c1 350 is 210 HP. The difference is pleasantly noticable well worth the time. Next summer I will add headers and possibly refresh the motor.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 305 to 350 swap completed!!
What you are also not catching is the fact you are gaining 40-50 ft/lbs of torque from idle-redline. With the gearing and converters used in these cars that is HUGE! The car pulls harder from a stop or a roll.
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Car: 89 chevy camaro rs
Engine: Tbi 305
Transmission: 700r4
Axle/Gears: 3:73s
Re: 305 to 350 swap completed!!
I will be making the swap very soon however im going with carb, i know its going to drink the gas a little more, but hell i have the old school crager Ss's why not go with carb, and the good oh turbo350 trans oh yes.
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Car: 1992 Chevy Camaro RS
Engine: 305ci TBI
Transmission: 700R4 Auto w/ OD
Axle/Gears: 2.73
Re: 305 to 350 swap completed!!
So, Jono4820, all you had to replace was the ECM and a few sensors? If that's it, I may do this swap... Did you have to replace fuel pump, or anything else major? Is there anything you would recommend that I replace while doing the swap, or any tips for doing the actual swap?
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Car: 1991 RS
Engine: 350 TBI
Transmission: 700r4
Axle/Gears: 3.08 lt. slip
Re: 305 to 350 swap completed!!
So, Jono4820, all you had to replace was the ECM and a few sensors? If that's it, I may do this swap... Did you have to replace fuel pump, or anything else major? Is there anything you would recommend that I replace while doing the swap, or any tips for doing the actual swap?
Overall the swap was surprisingly simple and fun to do, more importantly it was well worth the time and energy!!
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Car: 1992 Chevy Camaro RS
Engine: 305ci TBI
Transmission: 700R4 Auto w/ OD
Axle/Gears: 2.73
Re: 305 to 350 swap completed!!
I probably won't be able to swing the headers, unless I wait until tax time... I think I might spend the money on a stroker kit to make it a 383... I will probably leave it at a 350 for now though... I am currently searching for donor cars...
What did you use from your L03 on your L05?
What did you use from your L03 on your L05?
#14
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Car: 1991 RS
Engine: 350 TBI
Transmission: 700r4
Axle/Gears: 3.08 lt. slip
Re: 305 to 350 swap completed!!
I probably won't be able to swing the headers, unless I wait until tax time... I think I might spend the money on a stroker kit to make it a 383... I will probably leave it at a 350 for now though... I am currently searching for donor cars...
What did you use from your L03 on your L05?
What did you use from your L03 on your L05?
#15
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Car: 1992 Chevy Camaro RS
Engine: 305ci TBI
Transmission: 700R4 Auto w/ OD
Axle/Gears: 2.73
Re: 305 to 350 swap completed!!
This sounds like the swap for me... Now I just have to find an engine to do the swap with.... Is the car's acceleration any better? And would I need to start shopping for a stronger rear after the swap? I have no clue what my lil' old stocker can handle...
#16
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Car: 1991 RS
Engine: 350 TBI
Transmission: 700r4
Axle/Gears: 3.08 lt. slip
Re: 305 to 350 swap completed!!
Acceleration is much better. 305 motor had 170 HP with 255 lb-ft of torque 350 (9C1) has 205 HP with 300 lb-ft of torque. Improvement of 35 HP and 45 lb-ft of torque!
One would really have to build the chit out of a motor to hurt the trans or rear-end. If you can fine a 92 caprice 9C1 (police package) that is what I did and it worked great. Motor will need freshening....no big deal. HEre is what I spent. 92 Caprice 9C1 on Ebay 861.00 parts for the swap around 300.00. I resold the Caprice with the 305 in it instead of the 350 for 1000.00. My ballpark out of pocket cost for the swap was a little more than 100 bucks! I still will have to spend money to freshen the motor in the spring however, not a big deal as I will do all of the work my self...
One would really have to build the chit out of a motor to hurt the trans or rear-end. If you can fine a 92 caprice 9C1 (police package) that is what I did and it worked great. Motor will need freshening....no big deal. HEre is what I spent. 92 Caprice 9C1 on Ebay 861.00 parts for the swap around 300.00. I resold the Caprice with the 305 in it instead of the 350 for 1000.00. My ballpark out of pocket cost for the swap was a little more than 100 bucks! I still will have to spend money to freshen the motor in the spring however, not a big deal as I will do all of the work my self...
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Car: 1992 Chevy Camaro RS
Engine: 305ci TBI
Transmission: 700R4 Auto w/ OD
Axle/Gears: 2.73
Re: 305 to 350 swap completed!!
I'm probably going to have to go to a U-Pull it parts place like LKQ... The only caprices for sale around here have the big a** 2_" rims and ride higher than a fully lifted F250.... I can get a full engine from LKQ for $300+ and the computer for about $35.... I might be able to find something with headers on it.... Never know what you'll find in a place like that.... Of course I'll have to buy a gasket set, and some other typical replacement parts, but it'd be worth it I think...
You got a really good deal... What is your future build plan looking like? I want a strong street car (350-400rwhp), that can still be my daily driver (I live about ten minutes from my job), and have fun with on weekends....
You got a really good deal... What is your future build plan looking like? I want a strong street car (350-400rwhp), that can still be my daily driver (I live about ten minutes from my job), and have fun with on weekends....
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