You're welcome. I'm sure others can jump in and answer in more detail if needed. BTW, racers seem to like the 4 screw round tops better than the 3 screw ones, but either type is better than the flat top ones in my opinion.

And here I thought that he was going to get $150 for his flat tops.:stupid:

Regarding the 71 motor: My 73 supposedly had a 71 motor swapped in and when I rebuilt the 71 I found that the rods had the smaller 8mm bolts. I believe the 73 engine had the preferred 9mm bolts. Not sure any of what I said is correct(I took the previous owner's word that it was a 71), so maybe someone can clarify the 8mm vs 9mm stuff. Victor.

I believe that you are correct Victor.

I don't think it matters much though, unless one plans to built out the motor to a high horsepower monster.

I have read that the rods with 9MM bolts came in '73 model 240Z engines, therefor engines built for '70 - '72 model 240Zs engines would have the 8MM bolts. I have NOT heard of the smaller bolts being a big problem for street cars. I suspect it was probably a change Nissan made so the larger rods bolts could be used in production class racing. So if you are building a full race motor using L24 rods it would certainly be nice to have them but I don't think it is a must have item.

A free motor is always nice. I would still consider a L28 if you are going to be putting any time or money into the motor. At least here in California they are readily available and relatively inexpensive to find a rebuildable complete L28 motor.