First of all, I dont see the Frank swap as inferior or not worth doing in any case. Its a good combo that has been proven to handle PLENTY of HP and longevity.
Bad aspects? There are none.
"A bad one for example is cylinder wall wear, but of course a blockguard reduces the likeleness of the engine blowing due to cylinder wall flex, but still does not eliminate clyinder wall wear which eventually leads to ovel shaped cylinder and low compression and problems."
I dont know where you get this information. Cylinder wall flex can happen with any motor. Its not limited to a Frnkstn setup.
In our opinion, Blockguards are not necesarry. The stock block will handle 15psi of boost with no problems with proper tuning. If you plan on doing over 15psi, you should be SLEEVING the block already anyways.
The myth of LS/VTEC setups being bad are because of several factors.
1. Most use OLD or initially bad LS blocks to begin with. What do you expect with putting on a VTEC head on a 150K LS block that was probably pretty worn out already. and then REV it to 8K? of course, the block is old and can't handle that. No block can.
2. The other thing is that the DOHC VTEC setup requires MORE oil pressure than the reg non-vtec setup. You need to upgrade the LS block with a PROPER VTEC Oil Pump to handle the oiling needs of VTEC.
So to make it work and work well is NEW GSR Oil Pump and make sure that the block isnt bad to begin with.