Thread: Help with numbers on my 401
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Old September 5th, 2022, 02:52 AM
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Default Re: Help with numbers on my 401
You're welcome and since the intake is off post a photo of the head passages to see if they are magnums.

https://6066gmcclub.com/album.php?albumid=107
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1961 GMC Suburban 305A Overdrive
1962 GMC Utility 305D
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