6066 (1960-1966) GMC Truck Club - 401M Overhaul Done

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- - 401M Overhaul Done (https://6066gmcclub.com/showthread.php?t=50668)

Quigley

July 14th, 2019 09:57 PM

401M Overhaul Done

Finally got my 401M overhaul finished. Put on a couple hundred miles and all seems well.Ended up .030 bored,New pistons and rings,rod,main,and cam bearings.Ballanced the rotating assembly. 650 AVS2 Edelbrock carb and MSD ignition,keeping the points. 21/2 in exhaust with Jones turbine mufflers. I hope the tranny is going to hold. All I can say is WOW what a difference from the 305. It's got some burrs now. :upyes::upyes: Dave

Funky61

July 14th, 2019 11:17 PM

Re: 401M Overhaul Done

Congratulations! Post some photos and even a video too:thumbsup:

lizziemeister'sV6

July 15th, 2019 01:30 PM

Re: 401M Overhaul Done

Sounds great that you are on the road again! Just wondering if you reground the cam to the specs you got from Big Block? When I rebuilt my 351M I had a new cam reground to the specs. Seems that the cam kicks in around 2500 rpm - never have had engine reach 3000 rpm so only have used a small power band. You don;t live to far from me - we probably have seen each other! good luck with your build.:welldone:

TJ's GMC

July 16th, 2019 05:17 AM

Re: 401M Overhaul Done

Hope to hear a video at some point. :thumbsup:

Quigley

July 18th, 2019 02:46 AM

Re: 401M Overhaul Done

Quote:

Originally Posted by lizziemeister'sV6 (Post 71307)

No I did not do any thing with the cam other than bearings. I had a hard enough time finding parts and wanted to get it running. Just about gave up finding parts. Dave

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