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I know the obvious like the bore and stroke, but what about external dimensions and parts interchangablity, like heads, intake, tranny..................
 

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The heads will work on a 4.6,they are the same heads.The intake is different but Im pretty sure the tranny's will swap with each other.Turbo54 could answer the trans question for you.

Tim
 

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just about everything is interchangeable between the two. the 5.4 is slightly wider but is the same basic design of the 4.6.

the bolt pattern for the intakes are the same; they both mount to the same head. however there are numerous intakes for the trucks.

some plastic, some all aluminum, some plastic and aluminum. there are different placement of heater hose outlets; different mounting places for the sensors.
 
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