V6 Magnum Gaskets

[Quigley]

Originally Posted by 63gmc4x4

no the magnum and E engines are larger port intake and exhaust, luckily my old intake gaskets are intact will maybe ill have to copy them make my own

I have a 401M and have have had the intake off, 305 Gaskets fit fine on the intake side. Also had a full set of 305 Gaskets and a full set of 401 Magnum Gaskets there was No difference on the intake side either on the motor or the gasket sets. Exhaust was much bigger on the Magnun. Dave

[63gmc4x4]

they are different as you can in these pictures, the 305 may work but not right and may cause Intake leak luckily my old gaskets may still be usable

[63gmc4x4]

this is my 351E which is the same as the 351M and 401M with the larger ports on both the manifold and head, someone put a 305 small port intake this engine at one time if look close at my pictures you can see it was sealed correctly

[Chuck78]

Originally Posted by BobBray

You can try these guys:

http://www.olsonsgaskets.com/

I looked them up, but they have nothing in their catalog for 1960+ GMC truck specific engines. They can hand cut custom gaskets, but only paper/felt/etc, no head gaskets or anything with rolled metal sealing areas.

I have had some good luck with http://www.gasketstogo.com on Custom Suzuki 4 cylinder motorcycle & VW 4 cylinder IDI diesel MLS head gaskets in Multi-Layer Steel gaskets. They can custom make about anything. Sending a proper CAD drawing is best. We had some alignment issues on one batch of Suzuki GS650 custom big bore gaskets, but when a CAD drawing was sent for the re-make in lieu of a gasket scan or used gasket sample, all came out well.

[63gmc4x4]

thanks but I'm not computer wizard dont know how to do cad drawings of my old gaskets, and I dont want to send mine to Thailand I'm gonna look into reusing them or finding some gasket stock and making my own, thanks though

[63gmc4x4]

Originally Posted by beerman

Anybody have a source for Magnum gaskets?

Fel-Pro MS90065 INTAKE MANIFOLD SET
Fel-Pro MS90066 EXHAUST MANIFOLD SET

did you every find a set ?I know this post is over 2 years old

[Chuck78]

If I recall, someone on this forum has CAD drawings of many of our big block V6 gaskets already made up.

Cutting paper/felt/neoprene/viton/etc isnt too difficult. The rubbery materials are a bit tougher. A set of hole punch pliers or hollow point punches really help.

[Quigley]

Felpro 305 intake Gaskets will work fine on a magnum motor. Surface the exhaust manifolds on a belt sander surface machine and don't use Gaskets on them and your in business. Don't over complicate, that is my experience. Dave

[63gmc4x4]

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

[63gmc4x4]

Originally Posted by Chuck78

If I recall, someone on this forum has CAD drawings of many of our big block V6 gaskets already made up.

Cutting paper/felt/neoprene/viton/etc isnt too difficult. The rubbery materials are a bit tougher. A set of hole punch pliers or hollow point punches really help.

has anyone got some? or has anyone made there own gaskets