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Performance, Engines & Troubleshooting
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
351m or 400???

351m or 400???

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Old

Nov 21, 2008 | 12:22 AM

#1

COLMISS

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Joined: Sep 2008

Posts: 24

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From: Columbia, Mississippi

351m or 400???

Could someone tell me the easiest way to figure out wat engine I have. The PO told me it was a 351 but according to my vin its a 400.

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Old

Nov 21, 2008 | 07:09 AM

#2

MBDiagMan

Cargo Master

Joined: Dec 2004

Posts: 2,232

Likes: 3

From: NE Texas

The only significant differences in these engines is the crankshaft and pistons. If you can figure out a clever way to measure the stroke without pulling the head then you can figure it out.

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Nov 21, 2008 | 11:52 AM

#3

JBradley500

Posting Guru

Joined: Jul 2006

Posts: 1,354

Likes: 1

From: America

take out a spark plug and set a dowel on the piston. figure how far up and down it goes when you roll it over... if its 3.5" then its a 351m and if it's 4" then you have a 400.

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Old

Nov 21, 2008 | 05:51 PM

#4

Mud Rat

Senior User

Joined: Apr 2004

Posts: 259

Likes: 0

From: Eastern Ohio

If you take the oil pan off, you can find the casting number on the crank.
351M is 1K
400 is 5M

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