Believe power pack engines were good for 35 horsepower more than the two barrel counterpart with four barrel carb and pistons to bring the compression ratio to 9.5, the heads have 1.72/1.5 valves and about 60cc chambers.


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration