Difference in 305 and 350 - Off-Road Forums & Discussion Groups
GM Standard IFS Trucks & SUV's All discussion of full sized IFS Trucks, SUV's to include Suburban

Reply
 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 01-21-2001, 06:28 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Difference in 305 and 350

What are some differences between the TBI 305 and TBI 350. Hp, torque & fuel economy? Which lasts longer? Found a truck with a 305, but don't know if I should hold out for a 350.

Sponsored Links
Advertisement
 
post #2 of (permalink) Old 01-21-2001, 06:51 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Difference in 305 and 350

I don't know all the tech. stuff but I do know YOU WANT TO HOLD OUT FOR THE 350 !!!!!

MIKE.S 84GMC,454
post #3 of (permalink) Old 01-21-2001, 07:22 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Difference in 305 and 350

i dont know exact numbers, but i do know a 305 has a lot less balls than a 350 but gets the same fuel mileage so it wouldnt be worth it! wait for the 350. granted, you could modify it but (unless its a super deal or something special) i would suggest holding out for the 350 most people will tell you the same also

Mike ~
"I've got a shotgun, a rifle, and a four-wheel-drive and a country boy can survive!"
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 01-21-2001, 07:26 PM
Veteran
 
Join Date: Jan 2000
Location: Sweden
Posts: 930
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Difference in 305 and 350

The 350 outperforms the 305 in both torque and hp, while getting about the same milage. How long any of them last is more up to regular oilchanges than cubic inches[img]/wwwthreads_images/icons/wink.gif[/img]

In stock form the 305 has about 20hp & 25 ft.lbs less than the 350. If thatīs a whole lot is up to you to decide.

Andreas

Yes, the chefīs got a homepage[img]/wwwthreads_images/icons/crazy.gif[/img]
http://hem.passagen.se/znus/

Andreas is offline  
post #5 of (permalink) Old 01-21-2001, 08:31 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Difference in 305 and 350

Like pretty much everyone else here, I can't quote any numbers... But when I did the 305->350 swap in my '84 Jimmy, I actually gained about 3mpg and the vehicle actually became highway-driveable. I can't speak for the newer EFI beasties, but on the carbed engine, the difference was night and day.

-al.

post #6 of (permalink) Old 01-21-2001, 09:02 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Difference in 305 and 350

I can vouch that my 305 blows [img]/wwwthreads_images/icons/mad.gif[/img]

Yeeeee Hawwwwwww
post #7 of (permalink) Old 01-21-2001, 10:25 PM
Keyboard Implanted
 
Join Date: Jan 2001
Location: Mountain Home Idaho
Posts: 4,235
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: Difference in 305 and 350

I think that the 305 and 350 have the exact same block. Bore size and all. The only thing that is diferent is the crank.
Bore specs for 305 & 350 3.7350-3.7385
95 and earlier-3.9995-4.0025
95 and later 4.0007-4.0017

Those are specs from my Haynes service manual

I havent found the specs for the crank or the stroke I think these are the only difrences. Ill keep looking and maybe post them sometime if I found them.

Hope this helps
The Kid

The_Kid is offline  
post #8 of (permalink) Old 01-22-2001, 05:56 AM
Veteran
 
Join Date: Jan 2000
Location: Sweden
Posts: 930
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Difference in 305 and 350

Itīs the other way around[img]/wwwthreads_images/icons/smile.gif[/img]. The stroke is the same (3.48") but the 350 has a bigger bore than the 305. 4.000" vs. 3.740"

Andreas

Yes, the chefīs got a homepage[img]/wwwthreads_images/icons/crazy.gif[/img]
http://hem.passagen.se/znus/

Andreas is offline  
post #9 of (permalink) Old 01-22-2001, 01:56 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: Difference in 305 and 350

Hell, if your going to do a swap, do it right and drop in a big block. the torque is killer and the horse power is great. Just make sure you have the right gears for it. And NOT a 700 R4 tranny.

MIKE.S 84GMC,454
post #10 of (permalink) Old 01-22-2001, 07:36 PM
Keyboard Implanted
 
Join Date: Jan 2001
Location: Mountain Home Idaho
Posts: 4,235
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: Difference in 305 and 350

Nope the bore is exactly the same You could pull the pistons from a 305 and put them in a 350. Thats I know is the same I think the 305 has a shorter stroke. This would cuse it to lose the power on the bottom but would cause it to rev quiker making more power on top.
Thats why everyone prefers the 350 over the 305 in their 4bys they use the power on the bottom not the top end.
In my opion they are both good motors just depends on what you want.

The_Kid is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome