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View Full Version : 401M Overhaul Done

Quigley
July 14th, 2019, 09:57 PM
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
Congratulations! Post some photos and even a video too:thumbsup:
lizziemeister'sV6
July 15th, 2019, 01:30 PM
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
Hope to hear a video at some point. :thumbsup:
Quigley
July 18th, 2019, 02:46 AM
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:

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