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Compression for a 400?

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Old 05-23-2009, 10:59 AM
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Compression for a 400?
I'm looking at buying a used 400. What should the compression be and is there anything else I should look at/consider?
 
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Old 05-24-2009, 07:54 PM
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Make sure it's a 400 and not a 351M.
 
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Old 05-24-2009, 09:22 PM
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Originally Posted by Mud Rat
Make sure it's a 400 and not a 351M.
and how would I go about doing that? I know the only difference is the stroke, right? How can I measure that without tearing it down?
 
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Old 05-29-2009, 01:32 AM
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pull the oil pan off and look at the casting on the crank.
 
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Old 05-29-2009, 11:51 AM
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400 crank casting number are 5M, 5MA or 5MAB. 400 crank also have a small ridge at the front of the first counterweight, about one inch from the bottom of the counterweight witch 351m don't have. 351m casting is 1K.
 
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