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Old 07-02-2009, 02:34 PM
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351M/400 crankshaft
Is the crankshaft on the 351M and the 400 the same? Doing a 408 conversion and need to know if I need a new crank.
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2003 Ford Excursion LTD 6.0 PSD 4WD 164,000 miles
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Old 07-02-2009, 03:39 PM
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The "M" has a shorter stroke.
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Old 07-02-2009, 04:26 PM
mustang81 mustang81 is offline
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You'll need the 400 crank and the 400 pistons
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Old 07-03-2009, 02:11 AM
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I was told a while back that to use 400 pistons you have to use 400 rods because of the lengths between the 351M and 400 were different. But the same crank could be used as long as you change the pistons and rods.
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2003 Ford Excursion LTD 6.0 PSD 4WD 164,000 miles
1978 Ford Bronco 351M 4WD
(Full Restoration Project)
2001 Dodge Ram 1500 2WD
(Just aquired and thinking of dropping in a 7.3 or 6.0 PSD! )
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Old 07-03-2009, 02:15 AM
mustang81 mustang81 is offline
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The rods are the same.
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Old 07-03-2009, 03:12 AM
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Ok, thanks for your help guys.
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2003 Ford Excursion LTD 6.0 PSD 4WD 164,000 miles
1978 Ford Bronco 351M 4WD
(Full Restoration Project)
2001 Dodge Ram 1500 2WD
(Just aquired and thinking of dropping in a 7.3 or 6.0 PSD! )
Reply With Quote
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1978 , 351 , 351m , 351m400 , 400 , 400m , bronc , bronco , crank , crankshaft , decoder , ford , pistons

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