Should have no problem with a 150 shot on a 440 engine. That is only .34 horespower per cube added. My 170 slant is running 125 shot, and that is .74 horsepower per cube added. I have a totally stock short block, except for cam. This engine has had about 200 lbs of nitrous through it. One of my old engines with forged pistons, had more then 400 lbs of nitrous through it at a 150 shot. Ate a couple of pistons when I got greedy and went to a 175 shot, and missed the tune up.
