. . . The pcv systems for 235s had to have been a Calif. only thing as pcv for the rest of the nation did'nt come out until the '63 cars. (no more 235s by then)
A PCV system was available on some domestic GM small truck 6 cylinder engines as early as 1948. It was available as an option on all 1954 truck engines. It was not, however, standard on all trucks until much later.
