u would have to give cash on top of your gsr head just for a b16 head , just a thought , b16 longblock can be had for around 750 to 1000 my riding lawnmower has more torque though , just buy an ls bottem and and get an entire recuild kit with ctr or itr pistons for 230 shipped and buy arp rod bolts for 35 and have all 4 rods resized after installing bolts and walla bad ass ls vtec with your gsr head , i have arp mains and gsr girdle in my ls vtec and stock rods with arp bolts and a ctr head and spin 9500 rpm all day with a great power band and as much torque as can be expected out of a built b series , i have a gsr and ctr bottem end and another ls on the garage floor and i went with the LS , just a thought though , need any more info i just finished building another ls vtec for another customer tonight soooo pm if u need anything