Olds 350 Question List

[J.Rod22]

if you are leaving the computer you will be leaving everything in tact. all the random stuff like egr solenoids and all vacuum lines and i would even be leaving the air pump. it will definetly make the process a little more hectic getting all this stuff back in place but its possible. all of it will bolt up from the 307 to the 350

So what would I have to do about the O2 sensors if I use headers?

 

[CamaroAdam73]

Sorry, didn't mean to jack your thread. I just though from the title that it was an thread for anyone with an oldsmobile engine question 😛

 

[J.Rod22]

After going back and reading old posts I decided that it probably will be easier and less of a hassle if I just went without the computer. So that is what Im going to do. Is the computer harness seperate from the engine harness? Will I have to go without some of the sensors? I went through some of the pictures on here of peoples engines and they same to have less sensors on there 350 than I have on my 307. Also will my throttle cable and transmission cable bracket and lines connect to the 74-79 carbs or will I need to make some kind of modification to make the bracket/cables connect to the carb?

 

[DoubleV]

if you are leaving the computer you will be leaving everything in tact. all the random stuff like egr solenoids and all vacuum lines and i would even be leaving the air pump. it will definetly make the process a little more hectic getting all this stuff back in place but its possible. all of it will bolt up from the 307 to the 350

This isn't really the case. I made a detailed post on what you can and cannot remove when using the CCC system; viewtopic.php?f=3&t=26382

Jeezycol, whether you want to retain or remove the computer, make your decision based off of facts and not peoples perceptions on how they 'think' the CCC system works.

I think you should retain the computer. It makes the swap easier, not harder. If you want to dump it at a later date for whatever reason, then you can do so. The trick is, is to dump all the $hit you don't need on your car NOW before the engine swap. Read the above provided link.

 

[J.Rod22]

if you are leaving the computer you will be leaving everything in tact. all the random stuff like egr solenoids and all vacuum lines and i would even be leaving the air pump. it will definetly make the process a little more hectic getting all this stuff back in place but its possible. all of it will bolt up from the 307 to the 350

This isn't really the case. I made a detailed post on what you can and cannot remove when using the CCC system; viewtopic.php?f=3&t=26382

Jeezycol, whether you want to retain or remove the computer, make your decision based off of facts and not peoples perceptions on how they 'think' the CCC system works.

I think you should retain the computer. It makes the swap easier, not harder. If you want to dump it at a later date for whatever reason, then you can do so. The trick is, is to dump all the $hit you don't need on your car NOW before the engine swap. Read the above provided link.

Yeah that makes sense i guess I will try that first and see how that works.

 

[J.Rod22]

Hey guys I have been disassembling my olds 350 and today I was removing the heads. As I tried to remove the passenger side head I accidently let it fall and it got chipped when it hit the garage floor (concrete). I was wondering if the chip looks too bas or will it be alright. The chipped part is on the surface where the valve cover goes.

 

[J.Rod22]

So I was wondering when I get my engine disassembled what machine work.should I have done to it? Im just going for a stock rebuild.

 

[Rob]

Hey everyone, I'm Rob in Calgary Alberta. I've been lurking around this site for a while now and finally decided to chime in.

Jeezycol is asking some excellent questions here that I've often wondered about myself. I too have an '88 Cutlass Classic with a 307 and TH200-4R, and I'm considering dropping in a 350 rocket in the near future. We both seem to have the same goals with this engine swap: a moderate increase in performance without sacrificing (much) fuel economy and driveability. I also want to keep the computer to retain torque converter lockup, as almost all my driving is highway.

My Cutlass currently gets near 28mpg (imperial) highway, and I want it to stay that way if possible!

I want to reiterate a question asked earlier here, and then add two others that are definitely relevant to this thread ...

1. If you go with headers, what do you do with the oxygen sensor, assuming you want to keep the computer? Although it's likely been asked before, can anyone recommend headers that you know will fit if retaining all the emissions stuff? The engine compartment is already pretty crowded, I need to know they will fit.

2. I want to install true duals. I already ordered a dual hump crossmember. If I was to hook up the duals to my 307, will they also fit the 350 that I plan to drop in later? The cat has already been replaced by a straight pipe, if that makes any difference. Emissions testing is slack here in Canada.

3. Which would you be more concerned about dealing with the added power of a 350 ... the transmission, or the rear end?

Also regarding a question earlier, your car (and mine) has a 7.5" rear and 2.56 gears.

Thanks,
Rob

 

[olds307 and 403]

The 2004r and 7.5 rear have held up to my 403 fine enough. Keep the 350 or 403 mild and they shouldn't blow. I get mid 20's with my mild 403. The computer was all removed from the car when I got it. You can extend the O2 wiring harness and weld a bung in the collector. Keep the cam mild and compression reasonable to run on the computer. I am running the Painless lock up kit, works fine. You will retain the lock up if the CCC is left working. Service the rear and trans when you upgrade the motor.

 

[Rob]

That answers two of my questions, thanks. What about the dual exhaust though? If it hooks up to the 307, will there be any problems re-using it for the 350?