The 1953 powerglide engine was the first Chevy engine that had high pressure lubrication, and hydraulic lifters and insert bearings. The grind of camshaft was different from the solid lifter 235s because of the hydraulic lifters, and I think in mid 54 the journal size of the cam was increased. The rods were different because of the insert bearings, and the oil pump was also different due to the higher pressure.
Lot of changes happened in the car and truck 235 from 1950 to 1955. So it is important to get the right ID.
Pre68Dave is the real expert here.
Kurt
