Carburetors were used in all US L20B applications for both cars and trucks .
The engine used a carburetor but switched to fuel injection ( and round instead of square exhaust ports ) in some non-USA markets in 1977 .
Carburetors were used in all non-USA L20B applications for both cars and trucks .
The engine used a carburetor but switched to fuel injection ( and round instead of square exhaust ports ) in some non-USA markets in 1977 .