The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-15-2011, 02:46 PM   #1
McCoyAZ
Senior Member
 
McCoyAZ's Avatar
 
Join Date: Aug 2011
Location: Kingman, AZ
Posts: 1,376
How do you tell if it's a 305 or a 350?

I am building a 64 C10 Stepside and I ran across an 82 fleetside silverado today for $1000. I might buy it for the parts.

I want a 350 motor and the guy does not know which motor is in this truck.

How do I tell what it is?
McCoyAZ is offline   Reply With Quote
Old 09-15-2011, 02:50 PM   #2
Redcap
Registered User
 
Redcap's Avatar
 
Join Date: May 2010
Location: Lewis County, WA
Posts: 1,419
Re: How do you tell if it's a 305 or a 350?

Run the numbers on the back of the block.
Redcap is offline   Reply With Quote
Old 09-15-2011, 03:03 PM   #3
McCoyAZ
Senior Member
 
McCoyAZ's Avatar
 
Join Date: Aug 2011
Location: Kingman, AZ
Posts: 1,376
Re: How do you tell if it's a 305 or a 350?

I was hoping I could know from looking while I was standing at the truck?

Any certain number set identify the motor as a 350?

It is a long drive out there and back.....
McCoyAZ is offline   Reply With Quote
Old 09-15-2011, 03:58 PM   #4
406 Q-ship
Registered User
 
406 Q-ship's Avatar
 
Join Date: Oct 2010
Location: Largo Florida
Posts: 617
Re: How do you tell if it's a 305 or a 350?

Decoding the engine is the only true way to know for sure. Visually there is nothing that will give it away.
__________________
Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride!

Where patience fails, force prevails

Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle."
406 Q-ship is offline   Reply With Quote
Old 09-15-2011, 03:58 PM   #5
motornut
Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 6,728
Re: How do you tell if it's a 305 or a 350?

some may have it by the engine mount 3 0 5................3 5 0
one thing i did notice my truck
stock came with a 305, 2 line fuel pump
stock if it came with a 350 is a 3 line pump.....
not sure if that always applies
or try looking here......this is one
Attached Images
  
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 09-15-2011, 04:12 PM   #6
406 Q-ship
Registered User
 
406 Q-ship's Avatar
 
Join Date: Oct 2010
Location: Largo Florida
Posts: 617
Re: How do you tell if it's a 305 or a 350?

010 block means it is a 4.00 bore block so that would rule out a 305, but not all 350's have 010 blocks. The number of fuel line has to do with emissions and will not ID a 350/305. Run the codes on the pad in front the right cylinder head that is behind and kind of under the alternator. Checking the codes is the only sure way, short of pulling the heads off the engine.
__________________
Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride!

Where patience fails, force prevails

Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle."
406 Q-ship is offline   Reply With Quote
Old 09-15-2011, 06:03 PM   #7
rwhit57
Registered User
 
rwhit57's Avatar
 
Join Date: Jan 2011
Location: Tulsa,Okla
Posts: 521
Re: How do you tell if it's a 305 or a 350?

I have noticed some 305's have 2 sets of bolts for the starter. I don't know if this is true on the early ones or not.
rwhit57 is offline   Reply With Quote
Old 09-15-2011, 08:44 PM   #8
motornut
Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 6,728
Re: How do you tell if it's a 305 or a 350?

the reason i said about the lines was i just bought one
and i was told by Carter the two line pump was not used on a 350
but he said the third line it was to "return fuel to the tank"
when i asked if the two line will work on a 350 he said it should


but of course this means to it can be reversed i guess.....
meaning you could put a 3 line pump for a 350 on a 305 too then
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 09-15-2011, 09:02 PM   #9
McCoyAZ
Senior Member
 
McCoyAZ's Avatar
 
Join Date: Aug 2011
Location: Kingman, AZ
Posts: 1,376
Re: How do you tell if it's a 305 or a 350?

I found the easiest way in the world to determine what motor was in this truck......

I read the tag on the ait breather. 5.0 305
McCoyAZ is offline   Reply With Quote
Old 09-15-2011, 11:21 PM   #10
DetroitDan
Registered User
 
DetroitDan's Avatar
 
Join Date: Dec 2009
Location: Epping, NH
Posts: 604
Re: How do you tell if it's a 305 or a 350?

what about the vibration damper? Ive always told them apart that way. One is fat (I think its 305) and the other is thin. Obviously that could have been switched too, but generally if you're looking at an old dirty motor with an old dirty balancer it's a fairly safe bet.
Could be Im wrong and have some bad info, but the handful of motors I've checked have turned out to be right when checked that way.
__________________
1982 Chevy K30 CCLB fleetside. Formerly a cab and chassis, now a fleetside dually with the rear wheels tucked underneath. 454/th400/np205/C14/D60, 6/4 inch LIFT, not drop.
DetroitDan is offline   Reply With Quote
Old 09-16-2011, 12:28 AM   #11
taank
Account Suspended
 
Join Date: Mar 2011
Location: hastings mn
Posts: 186
Re: How do you tell if it's a 305 or a 350?

Usually it's cast on the back of the block.
Posted via Mobile Device
taank is offline   Reply With Quote
Old 09-16-2011, 06:43 AM   #12
sumran
Registered User
 
sumran's Avatar
 
Join Date: Feb 2011
Location: Gainesville, FL
Posts: 406
Re: How do you tell if it's a 305 or a 350?

Quote:
Originally Posted by taank View Post
Usually it's cast on the back of the block.
Posted via Mobile Device
Mine has 5.0L cast on the block next to the casting number.
__________________
Randy Summers

Never brake in the learning curve!

1984 GMC Sierra project truck http://67-72chevytrucks.com/vboard/s...d.php?t=446737
sumran is offline   Reply With Quote
Old 09-16-2011, 09:16 PM   #13
russgt
Registered User
 
russgt's Avatar
 
Join Date: May 2008
Location: Vernon, WI
Posts: 765
Re: How do you tell if it's a 305 or a 350?

an 010 block is a 350
__________________
68 stepside
76 blazer
77 shortbox
07 Sierra Z71

My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634
russgt is offline   Reply With Quote
Old 09-17-2011, 10:19 AM   #14
primrrd
Registered User
 
primrrd's Avatar
 
Join Date: Jun 2010
Location: houston, tx
Posts: 322
Re: How do you tell if it's a 305 or a 350?

I think that the exhaust manifolds were different too. I had one that was cracked, and bought a replacement "blind" ...it turned out it was a 350 and different than the ones my truck had.
(81 c10)
primrrd is offline   Reply With Quote
Old 09-18-2011, 07:58 AM   #15
Axle
Registered User
 
Axle's Avatar
 
Join Date: Jul 2011
Location: SW Ontario
Posts: 397
Re: How do you tell if it's a 305 or a 350?

Reading the casting number on the block will be the only sure way to know what you are getting. Print out the block casting number list to take with you as a guide over at nastyz28.

Consider the potential amount of engine swaps that could have been done over time, casting number is your only sure fire way to i.d.

My truck started out with a 305/700r4. That turned into a 350/700r4 w/the 5.0L manifolds and sheet metal. That turned into a 350/350 combo, and somewhere along the line I put my '73 passenger car exhaust manifolds on it. Looking at anything but the casting number isn't going to let you know what the engine is. Unless you are familiar with how it is supposed to be, you may note something isn't quite right, but won't be able to put your finger on it without something to reference.

Alex.
Axle is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 04:51 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 1997-2013 67-72chevytrucks.com