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
  #31  
Old September 24th, 2018, 09:57 PM
beerman beerman is offline
Member
 
Join Date: Feb 2016
Location: Yardville, NJ
Truck: 1968 GMC K1500 305E SWB
Posts: 47
Rep Power: 65
beerman is on a distinguished road
Default Re: V6 Magnum Gaskets

I tried to make magnum exhaust gaskets out of a sheet of the same material as the regular exhaust gaskets. The scrapbook cutter I used didn't have enough pressure to cut the material. I wound up cutting them out manually. I was able to get set of magnum intakes from a board member.
Reply With Quote
  #32  
Old September 24th, 2018, 10:20 PM
Quigley's Avatar
Quigley Quigley is offline
Senior Member
 
Join Date: Mar 2013
Location: New Hampton,Iowa
Truck: 1966 1000 Wideside 1962 1500 Wideside 401 Magnum
Posts: 187
Rep Power: 131
Quigley will become famous soon enoughQuigley will become famous soon enough
Default Re: V6 Magnum Gaskets

Quote:
Originally Posted by 63gmc4x4 View Post
your probably right, but what is the point of the larger free flowing intake manifold if it blocked by 1/2 inch hanging in gasket material from the smaller gaskets
They do not block anything,they are the same size. I have a 401M motor and 3 305s. The head ports are the same on the 401M,the only difference is the design of the 401 intake and the port for two cylinders are combined 305 Gaskets will work perfectly and not block anything. Dave

Last edited by Quigley; September 24th, 2018 at 10:32 PM. Reason: Add to it
Reply With Quote
  #33  
Old September 26th, 2018, 06:35 AM
63gmc4x4's Avatar
63gmc4x4 63gmc4x4 is offline
Member
 
Join Date: Sep 2016
Location: Orem,utah
Truck: 62 custom 1000, 63 K1000
Age: 43
Posts: 73
Rep Power: 68
63gmc4x4 is on a distinguished road
Default Re: V6 Magnum Gaskets

you must have a different 401M if the port size is the same as the 305, my 351E port size is alot bigger thus using a smaller 305 gaskets it hangs into the flow of the air/fuel mixture coming in, and or doesn't cover the complete gasketa surface area onto the outer edge ,sure it may seal up okay but may leak over time I just dont like the gasket haanging in the way from intake into cylinder head, did you see my pictures?
Reply With Quote
  #34  
Old September 26th, 2018, 06:42 AM
63gmc4x4's Avatar
63gmc4x4 63gmc4x4 is offline
Member
 
Join Date: Sep 2016
Location: Orem,utah
Truck: 62 custom 1000, 63 K1000
Age: 43
Posts: 73
Rep Power: 68
63gmc4x4 is on a distinguished road
Default Re: V6 Magnum Gaskets

I'll post another picture tomorrow of the size difference of the ports 305 vs 351E, then may you can understand what I'm trying to accomplish, maybe I have a one of kind 351E with very large ports or the 401M were smaller then the 351E? I've only had 305s apart this is my first 351, you can clearly see the differences in size with naked eye, thanks
Reply With Quote
  #35  
Old September 26th, 2018, 06:42 AM
Ed Snyder's Avatar
Ed Snyder Ed Snyder is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Medford, Oregon
Truck: 1962, 1965, 1967
Posts: 868
Rep Power: 343
Ed Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura aboutEd Snyder has a spectacular aura about
Default Re: V6 Magnum Gaskets

Quote:
Originally Posted by Quigley View Post
They do not block anything,they are the same size. I have a 401M motor and 3 305s. The head ports are the same on the 401M,the only difference is the design of the 401 intake and the port for two cylinders are combined 305 Gaskets will work perfectly and not block anything. Dave
When I bought my 401M many years ago, it came with non-Magnum heads and manifolds. It's possible yours did too.
__________________
Ed Snyder
Medford, Oregon
1962 1000 Pickup 401M & Muncie 318 with overdrive
1962 K1000 Suburban 401M & SM420
1965 2500 Suburban 351C & SM420 with Watson overdrive
1967 CM1500 pickup 351E & NP435
Reply With Quote
  #36  
Old September 26th, 2018, 06:48 AM
63gmc4x4's Avatar
63gmc4x4 63gmc4x4 is offline
Member
 
Join Date: Sep 2016
Location: Orem,utah
Truck: 62 custom 1000, 63 K1000
Age: 43
Posts: 73
Rep Power: 68
63gmc4x4 is on a distinguished road
Default Re: V6 Magnum Gaskets

Quote:
Originally Posted by Quigley View Post
They do not block anything,they are the same size. I have a 401M motor and 3 305s. The head ports are the same on the 401M,the only difference is the design of the 401 intake and the port for two cylinders are combined 305 Gaskets will work perfectly and not block anything. Dave
, possibly you dont have M intake or heads, do you have any pictures?
Reply With Quote
  #37  
Old September 26th, 2018, 12:58 PM
Quigley's Avatar
Quigley Quigley is offline
Senior Member
 
Join Date: Mar 2013
Location: New Hampton,Iowa
Truck: 1966 1000 Wideside 1962 1500 Wideside 401 Magnum
Posts: 187
Rep Power: 131
Quigley will become famous soon enoughQuigley will become famous soon enough
Default Re: V6 Magnum Gaskets

Quote:
Originally Posted by 63gmc4x4 View Post
, possibly you dont have M intake or heads, do you have any pictures?
They are Magnum heads. The Exhaust ports are much larger. On the intakes 305 Felpro Gaskets fit perfect Magnum motors have larger exhaust ports and a redesigned intake manifold,not large intake ports. Dave
Reply With Quote
  #38  
Old September 28th, 2018, 02:47 PM
63gmc4x4's Avatar
63gmc4x4 63gmc4x4 is offline
Member
 
Join Date: Sep 2016
Location: Orem,utah
Truck: 62 custom 1000, 63 K1000
Age: 43
Posts: 73
Rep Power: 68
63gmc4x4 is on a distinguished road
Default Re: V6 Magnum Gaskets

well the gaskets are not even close to the same as such they will hang in the air fuel path causing performance problem so i will be copying my old gaskets and making my own, pictures to follow
Reply With Quote
  #39  
Old September 30th, 2018, 12:12 AM
63gmc4x4's Avatar
63gmc4x4 63gmc4x4 is offline
Member
 
Join Date: Sep 2016
Location: Orem,utah
Truck: 62 custom 1000, 63 K1000
Age: 43
Posts: 73
Rep Power: 68
63gmc4x4 is on a distinguished road
Default Re: V6 Magnum Gaskets

well when you cant buy them make them!
Attached Images
File Type: jpg 20180929_170903.jpg (3.68 MB, Multiple views, 15 clicks)
File Type: jpg 20180929_161614.jpg (2.15 MB, Multiple views, 11 clicks)
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] Part # for Magnum Intake Gaskets Archiver Previous Forum Posts 0 May 22nd, 2010 02:18 AM
Re: [6066 GMC] Part # for Magnum Intake Gaskets Archiver Previous Forum Posts 0 May 21st, 2010 01:53 AM
Part # for Magnum Intake Gaskets Archiver Previous Forum Posts 0 May 21st, 2010 01:42 AM
Re: Intake Manifold Gaskets for Magnum vs. Non Magnum Archiver Previous Forum Posts 0 May 19th, 2010 03:12 AM
Intake Manifold Gaskets for Magnum vs. Non Magnum Archiver Previous Forum Posts 0 April 20th, 2010 02:46 AM


All times are GMT +1. The time now is 02:53 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 681711554703|1710424416|0