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Old November 21st, 2016, 04:45 AM
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TJ's GMC TJ's GMC is offline
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Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
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Default Re: 1961 GMC 5500 Tilt Cab Project

Your 401 should be a Magnum, if it's not I will be a little surprised. There are numbers stamped on the block just forward of the right head. If yours is a Magnum it will say 401M.

As for my 305, much better over the 2 barrel.

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Mileage is decent if I can keep my foot out of it and it has no problems lighting the tires in 2nd. I went with an HEI and dual exhaust(recommend, especially for a larger engines).

Ed Snyder would be the one to talk with as he has a 401 with a 4 barrel.

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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600


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