November 21st, 2016, 02:24 PM
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Senior Member
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Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
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Re: 1961 GMC 5500 Tilt Cab Project
The Magnum engines were introduced in 1966 so a 61 would just be the smaller port 401
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