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Let me ask this, How much of a weight gain is there over the old cast iron water pump, compared to the all new self contained electric units sold through CSR/meziere unit? Besides the 10-15 hp gains.

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The meziere pump for a BB is 7# The aluminum MP WP housing and pump with moroso motor is 14.5#

The stock WP housing and pump weighs 21# add pullys and 1.5# Moroso motor and your looking at 23 to 24#

So your looking at a 15# + minimum difference between a Meziere and a stock steel housing,pump and moroso motor.

Info from "sport440".