230 registered specifications for Chevrolet G20 Chevy Van 5.7 V8 TBI Hydra-Matic, 197hp, 1989. Engine & Performance, Dimensions & Weight, Exterior, Interior, Features, Safety & Security and Other. Detailed specs and features for the Used 1990 Chevrolet Chevy Van including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more. This 1990 Chevy G20 with the Mark III Conversion is in stunning condition and screams to be released on the open road with the family or friends. Sold new in Port Royal PA where it remained in the same family up until November of 2021. The car was rarely used and was originally purchased for the use of traveling to the family cabin. 8Zhn2C.