400 crank ID
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Freshman User
Joined: Feb 2011
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400 crank ID
Anyone know how to tell from casting numbers if my crankshaft is a 400 or a 351m crank.. I bought a spare engine last week and the heads are 400's. pretty sure its a 400 engine but i wanna make sure the crank is def a 400 before i take it to the machine shop. thanks
Super Moderator
Joined: Apr 2004
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Can you measure the crank throw? 2 inches is the magic number.
Scroll down about 2/3 of the page here for the casting number etc. info:
M-Block 351M/400 Parts Reference
Scroll down about 2/3 of the page here for the casting number etc. info:
M-Block 351M/400 Parts Reference
Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
400 crank have a ridge on the first conterweight. The stroke is 3.5" for the 351m and 4" for the 400. Stroke is the center line of crank to center line of connecting rod or piston travel.
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