It’s got the Z24 in it. I originally thought they all came with the KA24 like in the Nissan 240SX. Found out that was in the later models. Odd motor! When I first bought it I was doing some maintenance and purchased 4 spark plugs. I swapped out the 4 on the driver side and noticed there was 8 spark plug wires coming off the distributor. Followed a wire to the passenger side of the head and found another 4 spark plugs under the intakeThat's the perfect iteration of the d21- do you have the z24 or vg30 in it?