I'm just curious on approxamatly how much boost, or nitros a stock B20B/Z can take, because I know they have thin cylinder sleeves. Would a block girdle help out this weakness. Also if I put a vtec head on it, would a block girdle let me rev high more safely. (let's say 7500rpm, or maybey 8200rpm)

 

how much boost depends on how good you tune it.
i believe the block griddle is not needed unless you do lots of high speed high rpm high load runs.

 

if u want to rev over 7k
u should get arp rod bolts first(ls-vtecs weakness)
block gridle is not needed

i ve tuned 80 shot single nozzle wet on a stock block b20 with a b16 head
and haven t heard of anyone going over 120 shot. ran max of 26 degrees timing because of the low compression