For a OEM LS/B20 i/m i prefer the 94+ ls intake mani's.

B20's are good motorss for a quiuck bang for the buck. As far as the weak sleeves thing i havent seen it happen, and ive put stupid amounts of nitrous on b20's. It happens i suppose, but ive seen sleeves crack in ls's also.

Also for a N/A build i prefer a B20 block , just slap in some RS machine ITR pistons on stock rods with a b16 head...good to go.

The blocks are identical to ls blocks, mains, oil pump, rods, etc etc its all PR4. Minus the sleeves and the Bore.