6066 (1960-1966) GMC Truck Club

6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)

- GMC V6 and V12 Engines (https://6066gmcclub.com/forumdisplay.php?f=9)

- - 401 M Startup (https://6066gmcclub.com/showthread.php?t=49891)

Quigley

February 12th, 2017 02:26 AM

401 M Startup

https://youtu.be/bIMWFID3Zyk Video of 401M that I purchased out of San Antonio, Tx. Pretty Happy!!:upyes:

kchampagne

February 12th, 2017 02:42 AM

Re: 401 M Startup

Very nice!!!

bigblockv6

February 12th, 2017 07:21 PM

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.:thumbsup:

BillT

February 12th, 2017 11:30 PM

Re: 401 M Startup

Sounds good.

Funky61

February 13th, 2017 12:13 AM

Re: 401 M Startup

Congratulations! Sounds very Throaty and Muscular. :welldone:

TJ's GMC

February 13th, 2017 03:25 AM

Re: 401 M Startup

Runs like a top! :goodjob:

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