96+ NA vs SRT-4 other then the obvious what's the diference. like is the SRT-4 block stronger then the old na. is the cylinder walls thicker on the SRT. why the small exhaust valves and ports, why the long threaded spark plugs, it makes for less plug choises and what horse power can be had out of the stock valve srt head. if you are just guessing please don't respond I done that already. plus if you got more info on ether that would help too.