If the #46 heads on your 350 are 1969 than this would be the build i'm looking at. Those would be small valve high compression heads advertised at 68cc. But #46 heads are not that simple. Info I founds says one has pressed studs and the other has screw. The mid 70s #46 heads used on 350s had small valves. They were smog heads, some pressed some screw.. In true Pontiac style of course the 1974 #46 heads had big valves. Would it have been so hard to use a different number?
