Re: 1961 GMC 5500 Tilt Cab Project
I have done a 4bbl but have not tested it yet. I've heard from others it is a noticeable difference the bigger cubic inch V6 engines. GMC actually did offer a dealer installed option 4bbl conversion. The Magnum 2bbl manifold is based on that 4bbl manifold design it's just cast with a different top base and that's why it's so easy to convert it to a 4bbl. 600-650 cfm would be a good choice for the 401. TJ is the one to talk to about his 4bbl experience though it's on a 305 V6
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