(advancing the timing at high rpm for increased power), a thinner head gasket to raise compression to about 11.23:1, a gasket to block the heat riser of the carburetor (keeping it cooler), larger carburetor jets, high-capacity oil pump, and fiberglass shims with lock nuts to hold the ...
The Y82 Trans Am could be ordered with any of the three available engine options in 1977 but the most powerful engine was the introduction of the W72 400 cubic inch motor which matched the 200 horsepower rating of the previous year’s 455 cubic inch V8. The W72 engine is usually identif...
In addition, the OPEC oil embargo of late 1973 led in 1975 to the passage of the firstCorporate Average Fuel Economy (CAFE) standards, which took effect for the 1978 model year. CAFE required an automaker’s entire fleet to exceed a minimum average gas mileage (initially set at 18 mpg, ...