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Increasing displacement?


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Both could be done, but You'd be better off in the long run to use a 280 block with a 240 head rather than boring out a 240 block.

Try to find a 280ZX turbo block if possible. It has more meat around the cylinder walls than the regular 280 blocks. Either one is good really. Just make sure if you're pulling from a junk yard to get one with low milage (less problems). As for the head, it used to be that the elusive E31 head was the more desirable, but more and more people are finding out that the E88 head is just as good if not better (depending on who you talk to) than the E31. It's a straight bolt up, although you may want to see about increasing to the 280 valves (larger diameters) also.

There are plenty of websites that can give you information about this. Some on this site can help also. Start out at zhome.com and go from there.

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