September 4th, 2022, 11:20 PM
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Join Date: Jan 2013
Location: Corona, CA
Truck: 1961 Suburban 1962 GMC Utility
Posts: 1,218
Thanks: 104
Thanked 33 Times in 26 Posts
Rep Power: 442
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Re: Help with numbers on my 401
Check the Intake manifold and the exhaust manifolds as they should be dated and that may give you an idea
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1961 GMC Suburban 305A Overdrive
1962 GMC Utility 305D
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