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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old February 12th, 2017, 02:26 AM
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Default 401 M Startup

https://youtu.be/bIMWFID3Zyk Video of 401M that I purchased out of San Antonio, Tx. Pretty Happy!!
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  #2  
Old February 12th, 2017, 02:42 AM
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Default Re: 401 M Startup

Very nice!!!
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  #3  
Old February 12th, 2017, 07:21 PM
bigblockv6 bigblockv6 is offline
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Default Re: 401 M Startup

The 401M looks to be a 72 model year judging by the valve covers, yet it has the breather/filter in the back like pre 68 engines. Most likely it is a 72 built 401M that was a replacement engine for an earlier truck.
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Old February 12th, 2017, 11:30 PM
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Default Re: 401 M Startup

Sounds good.
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Drove:
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-'67 GMC 1500 Pick-up, 305 V-6
-'71 GMC 9500 Flatbed Dump, 637 V-8

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Old February 13th, 2017, 12:13 AM
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Default Re: 401 M Startup

Congratulations! Sounds very Throaty and Muscular.
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  #6  
Old February 13th, 2017, 03:25 AM
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Default Re: 401 M Startup

Runs like a top!
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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
1977 Chevy C20 572 BBC/TH400
1984 Chevy C30 292/SM465

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