The proposed theoretical solutions for revamping the unit for refining pyrocondensate into a unit for isomerization of the IBP-70 degrees C naphtha cut provide for a significant decrease in the aromatic hydrocarbon content, which makes it necessary to add large amounts of branched C-5-C-6 paraffins to the gasolines. These compounds can be obtained by isomerization of the corresponding linear paraffins in the IBP-70 degrees C cut.