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Great stuff there.
I loves me a Racing Kart, hard to believe it was Thirty Years ago for me

This is Bullhonkey misinformation, The Engine with Major Excessive Valve Lash will simply not run long before the Valves Don't Open at all. At that Point the Starter Does Not have Enough Snots to Turn the engine over.
There is just under .300" of Valve Lift with .250=1/4" so imaging that the ValveLash being .250" or more it would not run at that point.
you will never be able to break those parts mentioned. There are no seals up there and the Valve would be closed so It can't bend. just aint gunna happen.

The Poster's Motor is Clapped and Bagged Out, Any Mod's that would Increase  HP would be a Bad Idea without a Proper Complete Re-Build,  Thats a No Brainer.

Neil and Bob haven't demonstrated they have the combined knowledge or experience to get a job at the local lawnmower shop.

Ok that was a painfully long read, my eyes are bleeding and I'm going from uncontrolled laughter to fits of crying with the beginner level spores.

Neil and Bob aka 90GTVert and humanshield, what a joke these two are, half truths, little data, constant incorrect verbiage and internet parroting. 
OMG were do I even begin, a whole bunch of speculation, Neil states he runs his wot, ok at over 8,000 rpm and grenade it at over 9,000rpm, Ok fine if he's going to do so build the darn engine to do so.
Bob state a BB piston that could weigh the same as std. bore is a Fantasy, Really? Bob obviously Knows nothing of Piston design or technology.
It took six pages for Bob to have the epiphany that you May need to match the Combustion Diameter to the Bore Diameter. Huh? what is this Room #101 group A? Uh ya on the 50mm and 52mm with a Stock Head most Likely the Airsal Domed pistons are "Ghosting" the Head, uh ya you'll junk a rod,wrist pin, lower bearing all day doing that.
Not one in eight pages mentioned measuring the Squish clearance.
I see many are installing the larger BBk's on Clapped out high milage Motors the blame it on piston weight/pressure.

Bob also claims to have built car hot rods, Nitrous this Blown that, but he's going to have his cylinder head Fly Cut, Huh? ya Fly cut Valve reliefs on Pistons and Mill Cylinder heads.
h and Im crying over Bob's break-in procedure, A No load run, creates to much heat etc, what a joke this guy is.
And both Neil and Bob claim higher hp brings higher mph. really? ya only get to the same mph with more hp faster, one Must either or both Increase the Rpm or Gearing to achieve a Higher MPH. unreal these two are.
Omg then Lapping Valves, Im still crying. I spend countless hours facing a Valve to a precise angle then Cut the Seat to a perfect 1/2 Degree Difference Angle and upon startup they hammer home to a near perfect vacuum and these two think and put in writing that there going to make  my work better by Lapping the valves?  Ever wonder why No Engine mfg in the World Lapps valves? the only reason lapping and grinding compound is still sold is because these two idiots purchase it.
Not once did Neil or Bob mention doing anything to the Crank, Not even putting on a truing stand to check it. Bob states he checked the rod for freeplay. oh boy thats allot.
There going up or down in piston weight and not even mentioning Balancing the Rotation Assembly. unreal
I would bet the Cranks were barely in spec to begin with, ya wanna run a 50mm or 52mm WOT at 8 0r 9 grand.
I could do it all day, Its $65. bucks to have your crank Trued and the Pin Welded. wanna really go fast? a Pocket lighten is $265 or a Pork chop lighten is $285. easy stuff.

What MM size is the BBK?
Were and who is the supplier of the Cylinder Head you upgraded to.

What he said.
Good post, right on the money