Hey Larry,
From one gearhead to another let me toss this out for your consideration:
As you know when it comes to modified and performance engines it's always about "the combination" That is to say, no one thing is the magic answer.It's how all the mods work in concert with one another.
You yourself have said that Lump porting an inline 6 head as your only mod will not achieve much. Does this mean that Lump porting doesn't work? . . . of course not. When it's done in "Combination" with other mods it will yeild big dividends.
Here's another example: Race fuel when run in a stock motor will typically hurt performance. Does this mean Race fuels don't work? . . . of course not. A stock motor usually does not have enough compression to support proper combustion with Race fuel.
I agree with you that making more than one change at a time is not the best way to test things . . . usually.
I am starting to think however,that this "Groove" modification may be one of those "Piece of the puzzle" type mods whose peak potential is going to be realized in how well it compliments and even maximizes other modifications.
I know I don't post here often so I hope you don't take offense to my input. It's just that,to put it simply, I (and I'm sure you too) have seen the following many times while modifying engines:
This + that = Crap . . . . . BUT
The same:
This + that + a few other thing(s) = Improvement!
Once again . . .It's ALL about "The Combination"
Anyway, JMO . . . for what it's worth !
'Crockett
