When u swap a 305 for a 350 is there any thing else u need to swap to!! Some people tell me it will just bolt right in and every thing else will hook up to it fine!! Some people tell me to switch this and that to!!! What real needs to be done!!!

 

what do you have tpi or carb or tbi? either way you have to get bigger injectors or a bigger carb. and i think that you need a new knock sensor

 

THIS IS WHAT YOU HAVE TO DO,

Option A(Cheapest)
everything will bolt up but you need to following
1) an AFPR (So you can use the 19lb injectors, just bump up the fuel pressure to 50lbs i think.

2) a 350 knocksensor

Option B
L98 engine

1) 22lb injectors
2) Knock sensor
3) 350 EPROM

That is what you are looking at, I am going to do option A and later on I will be putting on a RamJet and Vortec heads so I will need 24lbers and a custom EPROM.

 

There are different 305's and different 350's out there. To properly answer, we would have to know: a) what year & type (carb, TBI, TPI) 305 you know have, and b) where your 350 is coming from. Tranny type would be helpful, too.

Because:
1) '86-later 305's have one-piece rear main seals. This affect the flex plate/flywheel and oil pan (you didn't say how complete this 350 is, either).
2) '87-later 350's and 305's have center two intake bolts on each side with a different angle than '86-earlier. Again, you didn't say how complete your 350 is, so you need to know what you've got and what you're getting.
3) '87-later heads have center bolt valve covers. Once again, need have/getting info if you plan on reusing the 305 parts.
4) Early 350's have the dipstick on the driver's side. This affects oil pan and ability to mount the dipstick itself.

Harmonic balancers are also different between 305's and 350's.


------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 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 & 3" cat-back).
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, LT MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1/95.5 @ 5800' Bandimere.

[This message has been edited by five7kid (edited June 09, 2001).]

 

woops, sorry thought i saw a TPI in there somewhere....

 

Thanks for your help sorry for not putting in all the info on the engine but i know what i need now!! Agian thanks for repling

 

I just completed a 305 to 350 switch today. How important is changing the knock sensor? I'm using the 305's sensor right now, and the engine doesn't want to rev when it's in gear. It revs happily in neutral. I'm also getting codes 12 and 32 which I not worried about right now. Could the 305 sensor be the cause of my problem? I also am still using the same Performance Resource from the 305.

I had '92 305tpi with a 5 speed. I now have a 355. the only other cahnges are: Dart Iron Eagle heads, hot cam, edelbrock base, and Accel 24lb injectors.

Please someone say it's knock sensor.

[This message has been edited by JJ63 (edited June 16, 2001).]

 

Camaro6speed- Are you saying you dont have to change the 305 computer if you keep the oringinal injectors? That would be cool.

Curtis

 

If you can't get a knock sensor right away, and want to see if that's your problem, take it out and wrap some teflon tape (like maybe two wraps) around the threads and reinstall it. That'll sort of ghetto desensitize it enough to see if that's the problem.

 

>...

------------------
Big 454 72 Chevy Nova
383 86 Camaro Z28
10.5:1compression Dart Pro 1 Aluminum heads 215cc,234dur.488lift exh&int,Victor Jr. intake, 770 Holley Avenger vac.sec 400 crank,flat top pistons,tranny shift kit,2500 stall converter. 3.42 ,Hooker Headers,2.5inchpipes with 40 s. Flowmasters,MSD coil,MSD module.

[This message has been edited by Big454blockchevy (edited June 19, 2001).]

 

You don't need to change the computer, but you will need to bump up the pressure and get a 350 PROM, or get 22lb'ers and a 350 PROM.

You really need the right chip, the computers are the same (comperable year of course)