More thoughts.
Ryan i'm not saying bigger is better or more power.
I have tested big siemesed plenum with big siemesed IH's on my 350 and dyno tested with no gains, yes there is a point where too big you don't gain anything.
I will also add cam timing is worth power
Now on big inch motors it might be a different story.
Here is what i have tested.
Tested the Hogan's intake on the 421ci it gained 10-12rwhp over the stock ported intake.
Made a believer out of me on LPE's droped & siemised plenum & IH's he had sad it was worth 15 chp.
Of course peak power was a couple hundred RPM higher this might be the effect of the shorter & straight runners also the Hogan's intake box/plenum is bigger then stock plenum.
Man did we ever screw Todd,sorry Todd
Maybe start a new thread.
If we can get a couple of sponsers for gaskets,car,dyno time/expense we can do the testing that Paul mentioned.
I'm also interested to see what the magic porting # would be.
Pete