6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > GMC V6 and V12 Engines


GMC V6 and V12 Engines Engine repair and rebuilding

Reply
 
Thread Tools
  #1  
Old January 5th, 2017, 08:50 AM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 137
Rep Power: 75
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Replacement 305 for a 1961

Hello all,
If I was on the market for a replacement engine, would y'all happen to know how flexible I can be in terms of the year?

I'm not looking to get rid of what I've already got..... I'm just hoping to kill two birds with one stone. My current engine has a knock until it gets warmed up. So, I'd like to pull it so that I can see what's going on and fix the problem (and hopefully learn along the way). But in the meantime I don't want the old man to sit around doing nothing. So I figure if I can get a decent rebuilt replacement put in, then I get the best of both worlds. But, I want to stick with the 305 V6.

I've got a 305D under the hood at the moment. He's a 1961 1500.

While I'm on the subject, if anyone has a suitable pre-loved engine just lying around. Well now, I might be able to take it off your hands LOL
Reply With Quote
  #2  
Old January 5th, 2017, 03:36 PM
TJ's GMC's Avatar
TJ's GMC TJ's GMC is offline
Senior Member
 
Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
Posts: 1,131
Rep Power: 296
TJ's GMC is on a distinguished road
Default Re: Replacement 305 for a 1961

That's gonna be some heavy freight there. I'll leave it to the experts that know the exact details, but I THINK any 305A-E should be pretty much a direct replacement.
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

My youtube channel aka Military Chevy:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #3  
Old January 5th, 2017, 06:29 PM
David R Leifheit's Avatar
David R Leifheit David R Leifheit is offline
Senior Member
 
Join Date: Jan 2013
Location: Dallas, Oregon
Truck: 1960-1966 1000-4000 series
Age: 55
Posts: 272
Rep Power: 121
David R Leifheit is a jewel in the roughDavid R Leifheit is a jewel in the roughDavid R Leifheit is a jewel in the rough
Default Re: Replacement 305 for a 1961

Quote:
Originally Posted by TJ's GMC View Post
That's gonna be some heavy freight there. I'll leave it to the experts that know the exact details, but I THINK any 305A-E should be pretty much a direct replacement.
Correct on both counts.
It -will- be a heavy freight..
and
Any 305A - E will (or should) bolt right up.
So will any 351 v6
__________________
--
- David R Leifheit
in Dallas, Oregon
mailto:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

(2) 1961 1500
1962 1000
1963 2500
1963 4000
1964 2500
Reply With Quote
  #4  
Old January 5th, 2017, 08:05 PM
TJ's GMC's Avatar
TJ's GMC TJ's GMC is offline
Senior Member
 
Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
Posts: 1,131
Rep Power: 296
TJ's GMC is on a distinguished road
Default Re: Replacement 305 for a 1961

Hey if you're not in a big hurry there is a guy on youtube Rebuilding a 305. It has been bored .060 over to. He's perrty dang smart, and the motor will be for sale when completed. 3 parts so far...stay tuned to see the rest.

Part 1: https://www.youtube.com/watch?v=FXPKRjzxRTo

Part 2: https://www.youtube.com/watch?v=oWesd1oXpFo

Part 3: https://www.youtube.com/watch?v=DtMB13ochL4
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

My youtube channel aka Military Chevy:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #5  
Old January 5th, 2017, 11:17 PM
Funky61's Avatar
Funky61 Funky61 is online now
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Chino, CA
Truck: 1961 Suburban
Posts: 630
Rep Power: 210
Funky61 is a jewel in the roughFunky61 is a jewel in the roughFunky61 is a jewel in the rough
Default Re: Replacement 305 for a 1961

Thanks for those links TJ!
__________________
1961 GMC Suburban 305A Overdrive
Reply With Quote
  #6  
Old January 6th, 2017, 01:43 AM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 137
Rep Power: 75
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Re: Replacement 305 for a 1961

Thanks for the links! Definitely one to watch later tonight.

When y'all say any 305 or 351 would work, does that mean I should be fine with anything from 1960-66? Or is there some practical benefit in trying to stick with one from the same year?

Last edited by Jmclendon; January 6th, 2017 at 01:44 AM. Reason: fat fingers (as usual).
Reply With Quote
  #7  
Old January 6th, 2017, 01:47 AM
TJ's GMC's Avatar
TJ's GMC TJ's GMC is offline
Senior Member
 
Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
Posts: 1,131
Rep Power: 296
TJ's GMC is on a distinguished road
Default Re: Replacement 305 for a 1961

Quote:
Originally Posted by Jmclendon View Post
Thanks for the links! Definitely one to watch later tonight.

When y'all say any 305 or 351 would work, does that mean I should be fine with anything from 1960-66? Or is there some practical benefit in trying to stick with one from the same year?
You should be fine with any 305 from 60-74. Personally I'd look for a 67-74 305E as they had a little more power. If I remember right....a whole 10 HP.
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

My youtube channel aka Military Chevy:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #8  
Old January 6th, 2017, 01:56 AM
Jmclendon's Avatar
Jmclendon Jmclendon is offline
-= Site Supporter =-
 
Join Date: Sep 2016
Location: Brisbane, QLD
Truck: 1961 1500 Stepside
Age: 34
Posts: 137
Rep Power: 75
Jmclendon is just really niceJmclendon is just really niceJmclendon is just really niceJmclendon is just really nice
Default Re: Replacement 305 for a 1961

Quote:
Originally Posted by TJ's GMC View Post
You should be fine with any 305 from 60-74. Personally I'd look for a 67-74 305E as they had a little more power. If I remember right....a whole 10 HP.
LOL I'm quite happy not worrying too much about the HP. The truck and I just don't have the souls of a hot-rod I'm afraid.

Thanks for the tip. That expands my options a bit....

Y'all are right about freight being an issue. But, I'm banking on a quality rebuild shipped on a container being cheaper (and less of a hassle) overall. Maybe... Hopefully.
Reply With Quote
  #9  
Old January 6th, 2017, 02:07 PM
bobdylan bobdylan is online now
Senior Member
 
Join Date: Mar 2015
Location: mclouth kansas
Truck: 64 Gmc suburbann 305e, 4speed. v12 truck engine, v12 irrigation,2-305e,305a,305d
Age: 61
Posts: 357
Rep Power: 105
bobdylan is on a distinguished road
Default Re: Replacement 305 for a 1961

I would think that a knock that went away after it warmed up, could not be to serious. If it was a rod bearing I think it would get worse. How is your oil pressure? You will see a drop in pressure if you have a bad bearing. Have you checked compression? I would not pull to investigate until I knew what was going on.
Reply With Quote
  #10  
Old January 6th, 2017, 08:54 PM
David R Leifheit's Avatar
David R Leifheit David R Leifheit is offline
Senior Member
 
Join Date: Jan 2013
Location: Dallas, Oregon
Truck: 1960-1966 1000-4000 series
Age: 55
Posts: 272
Rep Power: 121
David R Leifheit is a jewel in the roughDavid R Leifheit is a jewel in the roughDavid R Leifheit is a jewel in the rough
Default Re: Replacement 305 for a 1961

Quote:
Originally Posted by Jmclendon View Post
LOL I'm quite happy not worrying too much about the HP. The truck and I just don't have the souls of a hot-rod I'm afraid.

Thanks for the tip. That expands my options a bit....

Y'all are right about freight being an issue. But, I'm banking on a quality rebuild shipped on a container being cheaper (and less of a hassle) overall. Maybe... Hopefully.
You are talking an engine that has been known to kill an engine stand or two.

I'd say estimate 1000 pounds for engine and crate.
Weight of the engine/motor alone, according to Jolly's data:
305A = 738 lbs.
305B = 771 lbs.
305C = 840 lbs.
305E = 795 lbs.
351 = 860 lbs.
401 = 880 lbs.
478 = 925 lbs.
702 = 1485 lbs.
637 = 1219 lbs.
Then add crating.

As pointed out, 1960-1974 305 & 351
But also since you already have one in your vehicle, and thus the physical mounts aren't a concern (the metal mountings, not the rubber part although those are always a concern) you can also look for one out of any truck size. The 305 was available up through at least the 5500 series, and as far as I know the same holds true for the 351s as well. The mounting in the bigger trucks is typically at the front of the engine and the mounts on the bell housing, as opposed to the pickups where the mounts are on the sides of the engine and the bell housing.
__________________
--
- David R Leifheit
in Dallas, Oregon
mailto:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

(2) 1961 1500
1962 1000
1963 2500
1963 4000
1964 2500
Reply With Quote
Reply

Bookmarks

Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Replacement parking brake cable for 1961 Paul in Nola Wheels, Tires, Suspension and Brakes 0 April 18th, 2013 06:34 PM
Re: 305 v6 rear seal replacement Archiver Previous Forum Posts 0 May 21st, 2010 01:53 AM
Re: 305 v6 rear seal replacement Archiver Previous Forum Posts 0 May 20th, 2010 10:14 AM
Re: 305 v6 rear seal replacement Archiver Previous Forum Posts 0 May 20th, 2010 01:06 AM
305 v6 rear seal replacement Archiver Previous Forum Posts 0 May 19th, 2010 01:00 AM


All times are GMT +1. The time now is 08:10 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 119|0