The numbers refer to how many ci of air they push per revolution. You should be able to get more boost out of the 177. Neither one will fit under a stock hood. These superchargers are probably the least efficient ones out there. If you are serious about doing this you might want to also consider the 122 from magnacharger. And i highly recommend forged pistons. I'm running cast everything right now, but i have broken a lot of ring lands off, starting to run out of extra pistons.
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