How to: 305 To 350 swap....everything you need to know
#351
Re: How to: 305 To 350 swap....everything you need to know
Hey guys My first post I know this is a old post but im hoping to get a answer I have a 95 K1500 with a 305 tbi want to replace with a 350 tbi. My computer is a BJXL. So can I just put a prom chip in it? I found a prom BYXL for a 95 c1500 with a 350 is this what I need? thanks
#353
Re: How to: 305 To 350 swap....everything you need to know
Thanks for the fast reply they may have it listed wrong on eBay anyway if I find the right prom chip is that all I need or do I need to replace the computer also
#354
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Re: How to: 305 To 350 swap....everything you need to know
You just need a memcal from a 427 ecm and one of these bcc.
http://www.gearhead-efi.com/Fuel-Inj...Information-0D
http://www.gearhead-efi.com/Fuel-Inj...Information-0D
#355
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Re: How to: 305 To 350 swap....everything you need to know
This should be a byxn for the 427 ecm 5.7l auto
https://m.ebay.com/itm/GR-3-670-EPRO...QAAOSwY~lZ9jVX
https://m.ebay.com/itm/GR-3-670-EPRO...QAAOSwY~lZ9jVX
#357
Re: How to: 305 To 350 swap....everything you need to know
Thanks for taking your time to help out on that.so according to what you sent me all I need is the prom chip and my computer will work.so the prom chip is kinda like a hard drive for a pc. Thanks
#359
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Car: 91 camaro rs
Engine: 305
Transmission: 5 speed
Axle/Gears: 3.42 posi
Re: How to: 305 To 350 swap....everything you need to know
hi all, new to this site. just purchased a 91 r/s with 305tbi. i'm starting to gather the parts to swap in a 350. i have a 350 roller cam block with a balanced assembly with flat top pistons , and lunati efi cam with 219/227,471/480 lift, on the engine stand. i was looking at a new set of heads from epm machine in oregon. alu castings,vortec 64cc chambers,190runners,202/1.60 valves ,and tbi bolt pattern, for $799 . sound like a good combo ?
#360
Re: How to: 305 To 350 swap....everything you need to know
what about the knock sensors. i think the original 5.0L that came in my camaro came with two knock sensors, and this 5.7L only has one. i just checked under the car and have found what seems to be an extra knock sensor connector. would this affect the ECM in any way. seems like it would. if so, what can be done to address this problem?
#362
Re: How to: 305 To 350 swap....everything you need to know
@Sonoma92 what are you working on ?
year make model, ecm service number?
year make model, ecm service number?
#364
#365
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: How to: 305 To 350 swap....everything you need to know
Would an 87-89 Corvette ESC Module work for my 350 TBI swap? Ive got one of those and I figured it would match ok to my stock L98 knock sensor.
#367
Re: How to: 305 To 350 swap....everything you need to know
If you find out let me know my'n still isnt running right. Cant find a good chip and for 200 for a "custom one" i should just spend more for a upgraded comp. "Ebl flash"
#368
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Car: 89 Firebird
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Re: How to: 305 To 350 swap....everything you need to know
Sonoma92 you should talk with Brian aka Tuned Performance about that chip.
#371
Re: How to: 305 To 350 swap....everything you need to know
Hey guys, Im in the process of doing the 305-350 swap on my 901 RS. I have the 350 injectors,ESC and Knock sensor. No chip yet. I know if i dont change the chip it will run rich..But im also changing the entire exhaust to headers and NO cat with 3 inch. Also the air filter will be a K&N. will this lean it out enough? If not I need to find a chip.
#372
Banned
Re: How to: 305 To 350 swap....everything you need to know
I apologize if this is a repeat dumb question but I'm having a hard time finding a chip for my 1989 305 swapped to a 350 TBI. I found this one at Hypertech (129362 chip) it's for an 1989 Caprice. Their sales staff is useless at answering the followig question. "Will the 129362 chip work in my 1258746 ECM."
Do you know?
Thanks!
Do you know?
Thanks!
#374
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Re: How to: 305 To 350 swap....everything you need to know
https://www.ebay.com/itm/294329279870
Might ask for prom picture
Might ask for prom picture
#376
Banned
Re: How to: 305 To 350 swap....everything you need to know
I apologize but I'm not sure what atjp or anlu means. Are you saying I can buy the Caprice ECM on ebay and plug it into my harness?
#378
Banned
Re: How to: 305 To 350 swap....everything you need to know
Ah, okay. My current chip has ANTS printed on it. What do you mean by calpak?
#380
Banned
Re: How to: 305 To 350 swap....everything you need to know
I'd prefer to keep the 746 and just swap the chip if that's possible. The Hypertech part number is 129362 for its 1989 Caprice chip. They're trying to sell me the 5.7 TPI performance chip and I keep telling them it won't work. They know less than I do which is concerning.
So will an ANLU or ATJP based chip from an 1989 Caprice work in my car's 746?
So will an ANLU or ATJP based chip from an 1989 Caprice work in my car's 746?
#381
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: How to: 305 To 350 swap....everything you need to know
I apologize if this is a repeat dumb question but I'm having a hard time finding a chip for my 1989 305 swapped to a 350 TBI. I found this one at Hypertech (129362 chip) it's for an 1989 Caprice. Their sales staff is useless at answering the followig question. "Will the 129362 chip work in my 1258746 ECM."
Do you know?
Thanks!
Do you know?
Thanks!
129462.350 TBI "Copcar Caprice"
Last edited by dmccain; 10-25-2021 at 01:39 PM.
#383
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Car: 91 RS
Engine: 305
Transmission: T5
Axle/Gears: 3.73
Re: How to: 305 To 350 swap....everything you need to know
I got a notice on email for this thread. Wow it's still going after all these years.
#384
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: How to: 305 To 350 swap....everything you need to know
#385
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#387
Banned
Re: How to: 305 To 350 swap....everything you need to know
It's this one: https://westcoastengines.com/chevy-3...ne/tbi-300-hp/
#388
Re: How to: 305 To 350 swap....everything you need to know
Hi so last year I swapped my 1985 T/A 305 Tpi in to 350 TPI the 350 came from a 1986 k10. With the swap I put a bigger camshaft and a 1985 corvette Prom,350 knock sensor(it cam with the engine),22lb injectors,fuel pressure regulator and 1991 formula 350 ESC MODULE,I put my 305 heads and intake on it. Some how im still having problems with idling I do have a BBK throttle body,I’m using my OEM1985 Trans am ECM Can I have some help and tips please this car means so much to me
#393
Re: How to: 305 To 350 swap....everything you need to know
People are saying that the TPI ECU needs to be TUNED because of the bigger cam and engine but I don’t know if I need anything els can some one tell mee
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