Machining work 516 heads port work/bigger valves/hardened seats??

[CBODY67]

Considering where Chrysler Corp was in the earlier 1960s, I suspect the LA engine was about using more conventional (and less expensive) parts than making wild horsepower. Apparently, they did pretty well, considering how stout the stock 340 was, back then.

Interesting to see the renewed interest in the Polys!

CBODY67

 

[furious70]

Wedge head was absolutely a cheaper, less complex play.
Gen III hemi has some comparisons to the poly head I believe.