6066 (1960-1966) GMC Truck Club
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-   GMC V6 and V12 Engines (https://6066gmcclub.com/forumdisplay.php?f=9)
-   -   V6 Magnum Gaskets (https://6066gmcclub.com/showthread.php?t=49263)

beerman September 24th, 2018 09:57 PM
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.

Quigley September 24th, 2018 10:20 PM
Re: V6 Magnum Gaskets
 
Quote:
Originally Posted by 63gmc4x4 (Post 69805)
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

63gmc4x4 September 26th, 2018 06:35 AM
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?

63gmc4x4 September 26th, 2018 06:42 AM
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

Ed Snyder September 26th, 2018 06:42 AM
Re: V6 Magnum Gaskets
 
Quote:
Originally Posted by Quigley (Post 69808)
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.

63gmc4x4 September 26th, 2018 06:48 AM
Re: V6 Magnum Gaskets
 
Quote:
Originally Posted by Quigley (Post 69808)
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?

Quigley September 26th, 2018 12:58 PM
Re: V6 Magnum Gaskets
 
Quote:
Originally Posted by 63gmc4x4 (Post 69817)
, 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

63gmc4x4 September 28th, 2018 02:47 PM
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

63gmc4x4 September 30th, 2018 12:12 AM
Re: V6 Magnum Gaskets
 
2 Attachment(s)
well when you cant buy them make them!


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