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tell the dif between 400 351m ?

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Old 10-21-2005, 05:07 PM
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tell the dif between 400 351m ?
what is the easiest way to tell the difference?
 
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Old 10-22-2005, 01:19 AM
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valvecover or do a stroke test. They is no super easy way that I know about. Its like a 360 and 390, you have to measure the stroke.
 
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Old 10-22-2005, 01:12 PM
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what does the valve cover have to tell the diff?

the crank is getting ready to come out is there a casting number that can be used?
 
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Old 10-22-2005, 07:09 PM
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In that case, measure the stroke from the underside.
4 =400 3.5=351
 
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Old 10-22-2005, 07:43 PM
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1K is the crank casting # for a 351M. 5M, 5MA, 5MAB are casting #s for the 400.
 
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Old 10-22-2005, 09:36 PM
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thanks thats what iwanted ti know where is the casting mark at?

thanks guys
 
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Old 10-23-2005, 02:08 AM
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it's on the first counterweight of the crankshaft. 1K or 5M
 
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Old 10-23-2005, 04:32 PM
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The valve cover often has a sticker with the engine size.
 
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Old 10-23-2005, 06:51 PM
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cool i got a 400 crank thanks alot fellas
 
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Old 10-23-2005, 11:18 PM
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did you drop the pan? after all these years any valvecover/sticker could be on there.
 
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Old 10-24-2005, 10:54 AM
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no the crank is now in my garage (out) the motor is now striped to the bare block

thanks again guys
 
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Old 10-25-2005, 11:56 PM
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unless someone changes valve covers on you... found out the hard way on that one...
 
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335 Series- 5.8/351M, 6.6/400, 351 Cleveland
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