1. FullOfRage

    FullOfRage New Member

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    What's the difference between the 331 and 347 ?
     
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  2. 02 281 GT

    02 281 GT Active Member

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    The 331 has a 3.25" stroke crankshaft, the 347 has a 3.4" stroke crankshaft. There may be other differences, but that is the largest between the two.
     
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  3. RIO5.0

    RIO5.0 Mustang Master

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  4. 02 281 GT

    02 281 GT Active Member

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    The part about rod to stroke ratios makes me understand why people rarely seem to go bigger than 408 on a 351-based stroker.
     
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  5. revhead347

    revhead347 I have face herpes.

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    Just a stroke difference between the two.

    Kurt
     
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  6. Rick 91GT

    Rick 91GT SN Certified Technician Site Sponsor

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    There are stock production motors that have worse rod to stroke ratios...anything over a 4-4.1" stroke makes pistons a challenge for clearance.

    Sent from my XT907 using Tapatalk 2
     
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