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1970 240z restoration engine ideas

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Your original engine serial number should be something close to L24-016xxx - or it could be as early as L24-014xxx.   L24-120799 would have been found in Z's built around 08/72. Casting numbers on the Aluminum Head from 08/72 would be E88 - where Casting numbers on the original engine would have been E31. The Casting numbers are near the front (radiator side) of the head.  

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That is unfortunate that the tag is gone. It does sound like the motor has been changed already No easy way to confirm without the tag. Still a good car nonetheless. 

It's up to you to do what you want to do with it. Sounded like you wanted more power. Turbo, Stroker motor, even up to a V8. Lots of options.

HybridZ is another good forum for swapped motors and more as far as mods, although we would still like to hear about your plans. 

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