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Author Topic: XN block code on F-150 70 stamped form 400 eng.: 4bolt main or 2?  (Read 2849 times)

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SD-455 DAVE

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Hey!, I'm a computer newbie!:  cut me some slack!..Hey everybody what's your opninion of a 4 bolt main on XN(that's right!) 1970 400 form 400 engine?!..Date code stamped 70, F-150 Please help ASAP

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