externally, the 401 and 425 are the same engine with the same stroke.
so, if you're not going to pull a head off and measure the bores, the only way to differentiate is with the engine code stamping.
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externally, the 401 and 425 are the same engine with the same stroke.
so, if you're not going to pull a head off and measure the bores, the only way to differentiate is with the engine code stamping.