Compatible Parts 305 to 350 Swap
#1
Junior Member
Thread Starter
Join Date: Aug 2003
Location: Texas
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Car: '91 Firebird
Engine: 305 TBI
Transmission: 700r4
Compatible Parts 305 to 350 Swap
I have a Lo3(TBI 305) right now. I'm planning to get a junkyard 350 Block sometime soon. What parts can be transferred over to the 350. I don't have a lot of money and I don't have a lot of mechanic skills. Will my TBI setup w/computer, knock sensors, distributor and all transfer to an old 350 block? What parts absolutely won't go? I don't plan on trying to fit the heads on there, I think I know where to get some L31 heads (I think thats what they were). I Know I'll need a new intake if I go with the Vortec heads. I'll also need the bigger injectors too.
Thanks for any help you can give me.
Thanks for any help you can give me.
#2
Supreme Member
Join Date: Jun 2003
Location: Cypress,Tx
Posts: 1,521
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Camaro RS
Engine: 350 carbed now
Transmission: World Class T5
Axle/Gears: Peg Leg w/ 3.73's
Well you can basically swap everything on the top end , but since your going with vortec heads you will change the intake . You need a knock sensor out of a vehicle originally equiped with a 350 tbi for it to work with the computer, youll also need a custom tuned chip or a chip from a 350 tbi car as well. Also the injectors like you metioned. You cannot swith the harmonic balancer I know that for sure . You should be able to swap everything else though.Good luck you have a long road ahead of you.
#3
You can get away with all the 305 parts. THe only thing is it might run a little lean or rich. That's what I'm doing. I have a perf. cam also. It runs real strong but a chip would make it smoother. At certain rpm's it pulls harder. Until you have the extra cash for a custom chip, It will work.
#4
Junior Member
Thread Starter
Join Date: Aug 2003
Location: Texas
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Car: '91 Firebird
Engine: 305 TBI
Transmission: 700r4
So I could even use the crank? I'm pretty sure the pistons and rods won't work, will they? I'm not really sure where I could find another tbi car or truck around here for the computer/knock sensor. Or could I get way with using the 305 sensors and computer if I got a custom chip? Hey, how much should a junkyard 350 block cost? The local wrecker said he'd sell me a running 350 out of a van for $400. Should I just try for the shortblock?
#6
Supreme Member
Join Date: Apr 2001
Location: USA
Posts: 4,969
Likes: 0
Received 0 Likes
on
0 Posts
Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
You cannot swith the harmonic balancer I know that for sure .
#7
Supreme Member
Join Date: Jun 2003
Location: Cypress,Tx
Posts: 1,521
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Camaro RS
Engine: 350 carbed now
Transmission: World Class T5
Axle/Gears: Peg Leg w/ 3.73's
When I was in auto Tech at my high school my buddy and I tried to do it on his 350 block and my teacher said it wont work correctly on the 350.He may have been wrong but I believed him considering he is ASE master certified and has had a couple bad old cars that were heavily suped up. But if TKD89RS did it that proves me wrong right there .
Trending Topics
#8
Senior Member
Join Date: Jun 2002
Location: Michigan
Posts: 630
Likes: 0
Received 0 Likes
on
0 Posts
Car: 83 Camaro
Engine: 350
Transmission: th350
you may also need a different flexplate, i think i remember the problem being if your motor is a 86' up then it should have the weighted flexplate. the older style motors are internally balanced and so they dun have any sorts of weights
#9
Senior Member
Join Date: Nov 2001
Location: Bay Area, Ca
Posts: 692
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1995
Engine: 5.7
Transmission: T-56
since my car was a 89 i had the newer style engine. (roller) and my engine i got was a LO5, whcih was also the newer style. so i didn't need a flexplate if i had an automatic. but i did reuse the balancer. and all pulleys. theres pics of my swap here https://www.thirdgen.org/techbb2/sho...hreadid=146434
#10
Supreme Member
Join Date: Apr 2001
Location: USA
Posts: 4,969
Likes: 0
Received 0 Likes
on
0 Posts
Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Originally posted by IROCaholic
When I was in auto Tech at my high school my buddy and I tried to do it on his 350 block and my teacher said it wont work correctly on the 350.He may have been wrong but I believed him considering he is ASE master certified and has had a couple bad old cars that were heavily suped up. But if TKD89RS did it that proves me wrong right there .
When I was in auto Tech at my high school my buddy and I tried to do it on his 350 block and my teacher said it wont work correctly on the 350.He may have been wrong but I believed him considering he is ASE master certified and has had a couple bad old cars that were heavily suped up. But if TKD89RS did it that proves me wrong right there .
The newer 1 pc seal cranks are externally balanced, but only by the flexplate/flywheel. The dampers are the same.
If there's a weight on a harmonic damper, either throw it on a 400 crank, or in the dumpster. It doesn't belong anywhere else.
Last edited by AJ_92RS; 08-19-2003 at 02:27 AM.
#11
Junior Member
Join Date: Mar 2003
Location: Cincinnati, Ohio
Posts: 45
Likes: 0
Received 0 Likes
on
0 Posts
don't know if it was answered or not but yes you can use the 305 crank in the the 350. stroke is the same bore is not, rods yes pistons no(i may be wrong on that, if so someone correct me). and i reused my harmonic balancer as well.
and just asking a question here, but you dont really need a chip from a 350 to do the swap initially do you? im still running the stock 305 chip, the car could run better but it is getting me by for now.
and just asking a question here, but you dont really need a chip from a 350 to do the swap initially do you? im still running the stock 305 chip, the car could run better but it is getting me by for now.
#12
Supreme Member
Join Date: Apr 2001
Location: USA
Posts: 4,969
Likes: 0
Received 0 Likes
on
0 Posts
Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Originally posted by Nate's 88
don't know if it was answered or not but yes you can use the 305 crank in the the 350. stroke is the same bore is not, rods yes pistons no(i may be wrong on that, if so someone correct me).
don't know if it was answered or not but yes you can use the 305 crank in the the 350. stroke is the same bore is not, rods yes pistons no(i may be wrong on that, if so someone correct me).
Pay attention to that Aron213. He plays with a full deck AND has an Ace up his sleeve.
#13
Junior Member
Join Date: Mar 2003
Location: Cincinnati, Ohio
Posts: 45
Likes: 0
Received 0 Likes
on
0 Posts
so i was right.....finally im learning.
too bad i can't say the same for some of the people in that thread.
that thread makes me wonder though. i reused the rods and crank from my 305 to do my 350. i would imagine that the guy balanced everything. he's not a big name guy or anything but i personally think he does good work. this was the 4th or 5th engine the family has had done by him and not a problem one. think i'll just continue my faith in his work and stop questioning it....
too bad i can't say the same for some of the people in that thread.
that thread makes me wonder though. i reused the rods and crank from my 305 to do my 350. i would imagine that the guy balanced everything. he's not a big name guy or anything but i personally think he does good work. this was the 4th or 5th engine the family has had done by him and not a problem one. think i'll just continue my faith in his work and stop questioning it....
Thread
Thread Starter
Forum
Replies
Last Post
1994, 305, 350, 91, compatible, crackshaft, engine, firebird, flexplate, motor, parts, reusable, supe, swap, transmissions