drunktimmy12
New Member
i recently inherited a very nice 1973 riviera my uncle had. its a beautiful car. it has a 455 engine. it runs ok but gets horrible gas mileage. about 9 miles to a gallon of gas. is there any way to put something like a typical 350 chevy engine in it and get better mileage. i love to drive it but i just cant afford to cruise around that much with the way it sucks gas and i have to buy lead additives. im not expecting much because it is a big heavy car. but i would be happy if i could get 15 miles to a gallon on unleaded gas.