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#21
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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
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#22
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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
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#23
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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
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#24
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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.
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Chuck in Ohio *'62 GMC 1000 Panel Truck - 305D/Saginaw 4sp soon: 351C V6 + AX15 5sp OD trans, & 73-87/91 disc brake front end, rear Cadillac calipers/ AWD Astro rotors, Dana 44 redrilled to 5 lug *'88 Suzuki Samurai 4x4 project, VW 1.9L mTDI turbodiesel, Toyota V6 LandCruiser drivetrain, full floater axles, future LWB bed stretch *'77-'79 Suzuki GS motorcycles, '76 Rickman CR900 roadracer. *Dirtbikes: 2 Kawasaki KDX220R's, '77 Suzuki PE250, '83 PE175 |
#25
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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
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#26
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did you every find a set ?I know this post is over 2 years old
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#27
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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.
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Chuck in Ohio *'62 GMC 1000 Panel Truck - 305D/Saginaw 4sp soon: 351C V6 + AX15 5sp OD trans, & 73-87/91 disc brake front end, rear Cadillac calipers/ AWD Astro rotors, Dana 44 redrilled to 5 lug *'88 Suzuki Samurai 4x4 project, VW 1.9L mTDI turbodiesel, Toyota V6 LandCruiser drivetrain, full floater axles, future LWB bed stretch *'77-'79 Suzuki GS motorcycles, '76 Rickman CR900 roadracer. *Dirtbikes: 2 Kawasaki KDX220R's, '77 Suzuki PE250, '83 PE175 |
#28
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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
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#29
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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
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#30
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