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 > Transmissions and Rear Ends


Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

Reply
 
Thread Tools
  #21  
Old March 10th, 2017, 06:54 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: 1,257
Rep Power: 333
TJ's GMC is on a distinguished road
Default Re: 478 to SM420

Quote:
Originally Posted by bigblockv6 View Post
First of all lets not call the LS engine a Chevy Chevrolet does not deserve any credit for those engines. It is a Corporate GM engine manufactured by "The GM Powertrain Division" and was used by all GM divisions. I'd rather see someone stick one of these in their GMC rather than that ubiquitous small block 350 Just whatever you do don't give up on the 478 project because you'll have something that's different yet pure GMC and will have more than adequate power
Looking at the GMC V6 heads and the LS heads....port designs were very similar to!
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

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
  #22  
Old March 10th, 2017, 11:45 PM
AZKen AZKen is online now
-= Dues Paid =-
 
Join Date: Jul 2014
Location: State48
Truck: 1960 K1001 Wideside 305 BW Custom Cab
Posts: 790
Rep Power: 0
AZKen is infamous around these partsAZKen is infamous around these parts
Default Re: 478 to SM420

Sounds like BBV6's info on 401 is a good compromise. Be sure to take some Video of your 305 running so that when you sell it, folks can see it ran good. Did it smoke after sitting for years or it just smokes? If it's after sitting, could "tighten up "after awhile, after some thermal cycles. Does it smoke out the exhaust or breather or both? A bunch or a little? I had a 56 Chevy as a kid and ran it on 90 wt gear oil...and it still smoked. The gas station guy would ask me three times if I meant 90 wt. Don't do that.

Last edited by AZKen; March 10th, 2017 at 11:55 PM.
Reply With Quote
  #23  
Old March 11th, 2017, 12:12 AM
arepoff arepoff is offline
Member
 
Join Date: Feb 2016
Location: Walla Walla WA
Truck: 1965 K1000
Posts: 37
Rep Power: 21
arepoff is on a distinguished road
Default Re: 478 to SM420

Smokes light blue while running. This truck is off a wheat farm, it travelled in the fields all the time so I figure it has ate plenty of dirt in its life. I know the chassis has around 400k but I think this is the 2nd engine (at least).
Reply With Quote
  #24  
Old March 11th, 2017, 04:56 AM
bigblockv6 bigblockv6 is online now
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
Posts: 1,111
Rep Power: 309
bigblockv6 is on a distinguished road
Default Re: 478 to SM420

Quote:
Originally Posted by TJ's GMC View Post
Looking at the GMC V6 heads and the LS heads....port designs were very similar to!
I've got an LS1 in my 02 Trans Am, I see no resemblance in the port design whatsoever The LS1 ports are what they call "Cathedral ports", which have a triangular shape at the top of the port.
Reply With Quote
  #25  
Old March 11th, 2017, 06:37 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: 1,257
Rep Power: 333
TJ's GMC is on a distinguished road
Default Re: 478 to SM420

Quote:
Originally Posted by bigblockv6 View Post
I've got an LS1 in my 02 Trans Am, I see no resemblance in the port design whatsoever The LS1 ports are what they call "Cathedral ports", which have a triangular shape at the top of the port.
I'll have to scout that picture again, the heads were different but the ports were pretty similar. Not giving chevy any credit by any means.
__________________
"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

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
  #26  
Old April 20th, 2017, 11:22 PM
arepoff arepoff is offline
Member
 
Join Date: Feb 2016
Location: Walla Walla WA
Truck: 1965 K1000
Posts: 37
Rep Power: 21
arepoff is on a distinguished road
Default Re: 478 to SM420

Good news! My GMC will be staying all GMC. I found a rebuilt 305E with 0 miles, picking it up this weekend. Still plan on FiTech and HEI distributor.
Reply With Quote
  #27  
Old May 30th, 2017, 08:07 AM
fishhunter679 fishhunter679 is offline
Junior Member
 
Join Date: May 2017
Location: el paso texas
Truck: I don't own one - YET!
Age: 33
Posts: 2
Rep Power: 0
fishhunter679 is on a distinguished road
Default Re: 478 to SM420

Hows your progress?

Sent from my SM-G935V using Tapatalk
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
Re: [6066 GMC Truck] 478 gas vs. 478 diesel Archiver Previous Forum Posts 0 March 31st, 2004 03:37 AM
Re: [6066 GMC Truck] 478 gas vs. 478 diesel Archiver Previous Forum Posts 0 March 31st, 2004 01:19 AM
Re: [6066 GMC Truck] 478 gas vs. 478 diesel Archiver Previous Forum Posts 0 March 30th, 2004 01:23 AM
RE: [6066 GMC Truck] 478 gas vs. 478 diesel Archiver Previous Forum Posts 0 March 30th, 2004 01:21 AM
RE: [6066 GMC Truck] 478 gas vs. 478 diesel Archiver Previous Forum Posts 0 March 30th, 2004 01:08 AM


All times are GMT +1. The time now is 11:38 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 103|0
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.