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 October 22nd, 2022, 04:42 PM
tbucketnut tbucketnut is offline
Senior Member
 
Join Date: Oct 2019
Location: GIG HARBOR, WA
Truck: 64 1/2 ton
Age: 65
Posts: 203
Rep Power: 127
tbucketnut is a jewel in the roughtbucketnut is a jewel in the roughtbucketnut is a jewel in the roughtbucketnut is a jewel in the roughtbucketnut is a jewel in the rough
Default All 305 V6s are not created equal

Interesting problem I have with assembling my 305 for my GMC.
First off I was unable to use the original 305 in my 64 1000 wideside. I made a short trip down to Oregon and bought a used 305. I had this block cleaned mag'd and bored and honed to fit my pistons. At this point I had accumulated over the past two years, new pistons, main and rod bearings, cam and bearings , new timing gears and chain, and had the heads gone through with hardened exhaust seats.

I do all my own engine assembly and noticed right a way the .020 under main bears were loose in the webs and main caps -what the ****. Through a little bit of digging, I learned that blocks produced in 1973 and 74 had different housing bores for the main albeit the same journal sizes. It takes a 5061M main bearing set instead of a 4067M like 60-72 engines have.
Rod bearings are the same.
Did notice the rods in this 74 305C engine are a lot beefier than the 305E engine.
Cheers fellow friends,
Steve
__________________
Steve Stock
Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
Reply With Quote
  #2  
Old October 22nd, 2022, 09:31 PM
AZKen's Avatar
AZKen AZKen is offline
Senior Member
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,605
Rep Power: 513
AZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really nice
Default Re: All 305 V6s are not created equal

Good info Steve. Don't forget to post a video of the first start up! You can go into business rebuilding GMC V6.
Reply With Quote
  #3  
Old October 23rd, 2022, 02:05 AM
tbucketnut tbucketnut is offline
Senior Member
 
Join Date: Oct 2019
Location: GIG HARBOR, WA
Truck: 64 1/2 ton
Age: 65
Posts: 203
Rep Power: 127
tbucketnut is a jewel in the roughtbucketnut is a jewel in the roughtbucketnut is a jewel in the roughtbucketnut is a jewel in the roughtbucketnut is a jewel in the rough
Default Re: All 305 V6s are not created equal

I'll try and get a video up when the times comes.
If Somebody here needs a freshly ground and polished crank .020 undersize on the main journals and .020 undersize on the rod journals, with a set of almost impossible to find matching main bearings and a set of matching rod bearings. I will sell for my machining cost and bearing costs picked up in Washington State. This is ready to go for a 60- 72 block all cubic inches with 3.58" stroke.

Steve
__________________
Steve Stock
Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump

Last edited by tbucketnut; October 23rd, 2022 at 12:42 PM.
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
Album created Archiver Previous Forum Posts 1 December 1st, 2010 03:26 AM
Re: [6066 GMC Truck] Not over-reving 305 V6s Archiver Previous Forum Posts 0 June 13th, 2002 07:37 AM
Not over-reving 305 V6s Archiver Previous Forum Posts 0 June 12th, 2002 07:15 AM
Not over-reving 305 V6s Archiver Previous Forum Posts 0 June 12th, 2002 01:36 AM
Re: [6066 GMC Truck] Not over-reving 305 V6s Archiver Previous Forum Posts 0 June 12th, 2002 01:20 AM


All times are GMT +1. The time now is 03:31 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 681711554703|1710426666|0