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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old July 14th, 2019, 09:57 PM
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Quigley Quigley is offline
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Default 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. Dave
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Old July 14th, 2019, 11:17 PM
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Default Re: 401M Overhaul Done

Congratulations! Post some photos and even a video too
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Old July 15th, 2019, 01:30 PM
lizziemeister'sV6 lizziemeister'sV6 is offline
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Default 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.
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Old July 16th, 2019, 05:17 AM
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Default Re: 401M Overhaul Done

Hope to hear a video at some point.
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Old July 18th, 2019, 02:46 AM
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Smile Re: 401M Overhaul Done

Quote:
Originally Posted by lizziemeister'sV6 View Post
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.
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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