exhaust valve size increase on J head

Just thought I'd toss in my experiences with several LA engines that I built with various sized valves, porting and camshafts for my Mopars that are subject to smog regulations. (Hope I'm not hijacking the thread!)

In order to take advantage of porting, you need a sufficient static CR; otherwise you just won't get the flow at low RPMs. I think 9.5:1 is about the minimum CR for a ported LA. Unfortunately, a carbureted LA engine (360 CI) with 9.5 CR won't smog in California. Too much NOx. When I reduced the CR on this engine to pass smog, it was pretty much a dog off the line, but it does quite well once the RPMs are up. I'm pretty happy with the engine, and since it's in a B-200 van, I don't do any street racing with it anyway! The engine has a lot of power on steep hills in this heavy van, once the RPMs are up.
The biggest cam I have ever gotten to smog in California is the dual pattern MP P4452759
(260° - 268°; .430-.450" lift).
Hope somebody finds this info useful.