Darton

The Darton SR20DET Dry Sleeve Kit is made from Darton's famous high strength Ductile Iron and designed specifically for the Nissan SR20DET blocks. The new sleeves will be supplied for bore sizes from 86mm - 90mm. The new multi-diameter sleeve, with flats assures max-wall thickness for strength at any bore size.Sold as a set of 4.

This is for an individual sleeve.  It has double flats and will be used for cylinder 2 and 3.

This is for an individual sleeve. It has a single flat and will be used for cylinder 1 and 4.