Quote Originally Posted by 1439/2000
Here's an example of a laurel that the motor could have came out of. Even blacktops were in some z31s thats still like 86-87.
Forbidden links removed. Here's what I got from the site.

Engine variations: The rb20det came in two different forms, the earlier red top with the NICS system and the newer silver top version with the ECCS system. The red top is the earlier version of the rb20det and came as standard with the r31 skyline, z32 fairlady and the nissan laurel, whilst the r32 skylines and nissan cefiro came with the silver top version.

RB20DET Redtop
1986-1987: 178bhp (NICS version)
1988-1989: 190bhp (ECCS version)
RB20DET Silvertop
1989 onwards: 214bhp