[bigblockv6]

There was a horsepower increase from 142 net hp to 157 in 1966 as well as different cam timing, a newer style fuel pump and eccentric. In 68 the ventilation system changed, the breather from the back of the block was eliminated & capped off and new a breather cap with tube ran from the passenger side valve cover to the air cleaner. Thermostatic air cleaner was added to 1/2 ton models in 68, though none of these changes took place in 69, the 69 305E was basically identical to the 68 305E.