409 V-8 for Medium Duty Trucks?
 

While the 427 V-8 initially showed up to replace the 409 V-8 in the cars for 1966, but didn't it continue to exist for the medium-duty trucks through 1967 alongside the new 366 that took over from the 348?

The 409 would only have gone into the Series 80 tilt-cabs.

The medium-duty 427 with the taller deck and forged crankshaft didn't show up until 1968.

~Ben

Re: 409 V-8 for Medium Duty Trucks?
 

The 'truck' 409 was introduced in 1962 C and M series conventionals, L series short conventionals, and T series tilt cabs. Last year for the 409 'truck' was 1965, in 1966 it was replaced by the tall deck 366. In 1966 Chevy started selling GMC H and J series trucks, and the only gasoline engines available in those models was the GMC 401 and 478 V-6's. Starting in '66 the Chevy tilt cab was also available with the larger GMC V-6's. In '66 and '67 the largest Chevy V-8 available in commercial trucks was the 366.