[Jay S]

I think the Red Holley street pumps are quieter than they use to be. The higher pressure Blue and Black pumps are still noisier though. I would not put a Carter pump to feed a Robbmc, the Carter is a little smaller pump than a Holley. The Holley Red matches up better to the Robbmc.

I have check valves to bypass the Carter pump, which is a kit you can buy. The Carter pumps seem to have the vanes not draw in as easily as the Holley’s for running on just the Mechanical pump.

I just helped a friend put on a Holley Red in series with Carter strip/street Mechanical pump. His electric pump is just on when he arms the NOS system. Otherwise it runs on the mechanical pump all the time, it has 3/8 line, 550+ HP.