If youre gonna race (non-drag), H-series is out of the question. It weighs anywhere from 225-275lbs more than your stock engine, depending on motor and options. Thats like having a big fat dude sitting on your front bumper.

A b-series motor only weights 60-100lbs more than your stock motor, depending on motor and options. That difference is almost negligible. Your A/C alone, weighs close to 60 lbs all together.