supercharge b18 or b20

[crashsvg]

hey guys am new to this forum and am seeking some advise..i have a gsr with a vortech supercharger running 9psi of boost with some mods and dyno's 260whp.
my block is stock and am reach the level of safely making more power.

am interested to know from your experience would it be better to bore or stroke out my b18c1 block or buy a b20b long block and bore or stroke that out?

 

[99sidude]

Keep the gsr block. It is better than a b20 block because it has a better crank, has oil jets to cool the pistons, and has a block girdle. Both blocks are basically the same casting, its just that the b20 comes bored out more, and the gsr has those extra goodies.

 

[thompy.mark]

sleeve the gsr block to 84mm. with the gsr crank it will make about 1.9lL from memory, and you get the benefits of the oil jets/better balanced crank etc