I've been reading all the stuff I can find on interchanging 240/280 engine parts.

I have a 1976 280Z with a N42 block and N42 head. It has a destroyed rod bearing (#5) which chewed up the crank journal. The top half of the rod bearing is gone and the bottom half is smashed paper thin.

The car has an automatic and I wanted a 5-speed so I found a 240z engine and 5 speed, cheap.

The 240Z motor is a P30 block and a E88 head. I did a compression check on it and one hole is at 35, the rest are decent.

I'm in CA and 1976 is still a smog year so I need to retain the stock EFI, I believe.

As I think I have figured out, assuming the 240Z crank, rods and pistons are good, I can put my N42 head on the P30 240Z block (new bearings and seals of course) and all should work?

Thanks!

Don't see why it wouldn't start/run etc.. However I wouldn't want to bet that it would pass smog in CA. You would be pumping the fuel/air mix specified for an L28 - into the smaller volume of the L24 cylinders...and that might make it run very rich... I just don't know for certain..

You'll be down on torque/hp for a heavier car than the L24 was found int. It would also make it harder to resell if the need arises. You should be able to find a good L28 block in California - I'd do that...

FWIW,

Carl B.

Good points Carl.

I saw a used crank, rods, pistons from an L28 on C-list. I'll take a look at that.