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Visual comparison of cylinder heads of ZMZ 24D/ZMZ 2401 and ZMZ 402/ZMZ 4021 engines. ZMZ 2401 and ZMZ 4021 are versions of the corresponding engines for 76th gasoline, differ in the height of the cylinder head, the length of the tappets. ZMZ-402.10: — compression ratio 8.2 — compression 10 kgf/cm2 — cylinder head height 94.4 mm — rod length 283 mm (54-1007175) ZMZ-4021.10: — compression ratio 6.7 — compression 8.2 kgf/cm2 — cylinder head height 98 mm — rod length 287 mm (21-1007175-B) To convert the ZMZ-4021 engine from 76th to 92nd gasoline, the manufacturer recommends trimming the lower (adjacent to the block) plane of the 4021.1003007 cylinder head by 3.6 mm and replacing the 21-1007175-B rods with 54-1007175 rods.