The first generation 1969-72 K5 Blazer and 1970-72 GMC Jimmy are beautiful classic full-size sport utility vehicles. They are functional, easily modified or restored, and have always held a high value of popularity.
One modification some will consider is to swap out the small block Chevy engine for a big block. This swap is fairly straightforward if the desire is to keep the original TH350 or original manual transmission. The swap process goes a bit sideways when someone wishes to deviate from the factory transmissions. One such example is using the TH400 transmission.
