The 235, if my memory is correct, was pressure oil in powerglide 53 chevy cars for sure.
The 261, if my memory is correct, came out in only the two ton trucks utilizing the cam shaft from the early corvette to help with torque in the trucks..... I think.
I have a 261 i built in my 50 chevy coupe and while it is not on the road yet the engine sure runs sweet up and down my street and I've had the 216's/235's ect.
