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240z engine rebuild question, CRANK ISSUE


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I have rebuilt my 72   240z, and completley rebuilt the entire engine, rings pistons bearings the whole nine yards. I have recently acquired a 260 crank and a 280z motor. The 280 z needs the lower end rebuilt it smoked alot. Heres my big dielema. Should I just swap my 240 crank with the 260 to up my motor to a 2.6?? or just rebuild my 280 lower end and swith the higher compression heads off the 240 and go that route. Or just not worry about it at all.

 

Would I see any power differance, throttle response, or anything if I just changed cranks?? would it even be worth the effort??

 

This is weekend/ daily driver/ show car and I was just trying to up it in power range a little. I bet this has been addressed before but I cant find anyone that has switched and noticed any differance. Any info would be helpful, you gise are the experts i'am just an athusiast.  Thanks again    Datsun Zman04

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