351M or 400?
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Freshman User
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351M or 400?
I just bought a 2wd 79 3/4 ton Supercab. When I bought it the guy wasn't sure, but he thought it was a 351. I looked to find it as an S-code 400. The motor has tons of power and looks to have been rebuilt not too long ago. All the stickers are gone from the valve covers and the radiator support looks to have been cut out wider on one side, so now I'm a little curious. Is there an easy way to tell the difference by just looking at the motor? I did notice that the oil dipstick on my 78 400 is on the drivers side and this one is on the front off to the pass side a little like my 77 351M. Does that mean anything?
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Freshman User
Joined: Feb 2007
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So you're saying the different location of the dipstick has nothing to do with it and this could still be the correct 400? I'm not qestioning your knowlege by any means. I just got confused when I noticed it, and not that it makes a huge difference to me which one it is, it's just nice to know. I don't plan to tear it apart just to find out, because like I said, the thing looks pretty fresh and clean and has no problem rolling smoke off the tires.
Logistics Pro
Joined: May 2003
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From: Northern Illinois
Originally Posted by aironly
i have been told there is a "m" stamped at the front of the block on 400's
Elder User
Joined: Sep 2003
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You could check the vin, but that only tells you what the truck came with originally, it could have been swapped with just about anything by now. The only way to tell for sure is to check the crank. i think on the first counterweight a 400 will have something like 5M on it.
New User
Joined: Nov 2007
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yes there are M's on the block in the casting number they are 5M, 5MA, 5MAB, 5MABC. these are 400 casting numbers . You can look at this at www.tmeyerinc.com on the home page .
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Logistics Pro
Joined: May 2003
Posts: 4,238
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From: Northern Illinois
Those are the casting numbers. It does signify that it is an M block for figuring out if it is a 351M or a 400.
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