Rebuilding 305 or replacing with 350 question
03-14-2008, 01:05 PM
#1
Rebuilding 305 or replacing with 350 question
Hey everyone,
I'm going to be rebuilding or replacing the 305 in the next month in my Carbed84 T/A that has the CC Qjet on it. This isn't a carburetor question persay, so if this is the wrong forum for this, I apologize! I was wondering, since the TBI guys don't like carb guys asking questions, what, if any changes will I have to make to my ECM if I swap from the 305 to the 350?
Thanks in advance for any advice!
I'm going to be rebuilding or replacing the 305 in the next month in my Carbed84 T/A that has the CC Qjet on it. This isn't a carburetor question persay, so if this is the wrong forum for this, I apologize! I was wondering, since the TBI guys don't like carb guys asking questions, what, if any changes will I have to make to my ECM if I swap from the 305 to the 350?
Thanks in advance for any advice!
03-14-2008, 01:22 PM
#2
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Car: 89 RS
Engine: 305
Transmission: Auto w/ evil shift kit; not my doin
Axle/Gears: It has a locker; not my doing
Re: Rebuilding 305 or replacing with 350 question
Since the ECM adjusts the air to fuel ratio from the information it gets from the o2 sensor, I doubt that you'll need to do anything. The quadrajet that comes on a 305 can definately flow enough for a 350.
03-14-2008, 11:54 PM
#3
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
What I had to change when I put the 350 under the stock 305 carb:
1) Adjust it to factory specs.
2) Drive and race it.
1) Adjust it to factory specs.
2) Drive and race it.
03-15-2008, 10:27 AM
#4
Supreme Member
Re: Rebuilding 305 or replacing with 350 question
If it's a mild 350 combo (no big lumpy cam) the system will work just fine with no changes. Carbs don't know how big an engine is under them- they only know airflow.
03-15-2008, 11:22 AM
#5
Re: Rebuilding 305 or replacing with 350 question
Damnable thing is if I want the 350, I'll have to drive from Utah back to New Mexico to get it so I don't have to buy another block...had to leave it in storage because I didn't have any room left to pack it!
03-15-2008, 11:46 AM
#6
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It would probably cost less to buy another block than it would to drive from Utah to New Mexico and back to pick up the one you have. Unless you combine it with a trip for another purpose, of course.
My brother has a roller block 350 that he'll give me. Bad news is it's a 330 mile drive one-way, and the diesel truck would eat up $350 of fuel to go pick it up. That's an expensive shortblock.
My brother has a roller block 350 that he'll give me. Bad news is it's a 330 mile drive one-way, and the diesel truck would eat up $350 of fuel to go pick it up. That's an expensive shortblock.
03-15-2008, 11:54 AM
#7
Re: Rebuilding 305 or replacing with 350 question
It would probably cost less to buy another block than it would to drive from Utah to New Mexico and back to pick up the one you have. Unless you combine it with a trip for another purpose, of course.
My brother has a roller block 350 that he'll give me. Bad news is it's a 330 mile drive one-way, and the diesel truck would eat up $350 of fuel to go pick it up. That's an expensive shortblock.
My brother has a roller block 350 that he'll give me. Bad news is it's a 330 mile drive one-way, and the diesel truck would eat up $350 of fuel to go pick it up. That's an expensive shortblock.
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