best mechanical pump for high hp small block

zhandfull said

These pumps look pretty nice. Doesn't look like they have any mopar pumps listed, but based on some of the pump pictures. It looks like they start with a factory style pump and just modify it with their own inlet and parts.

Might be worth a call over to them if your serious about a nice mechanical pump.

http://www.robbmcperformance.com/products.html

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I have a RobbMc fuell sender on my car. It's got a 1/2" pickup tube, -8 outlet fittings and a provision for a return which I don't use. I don't believe they make a pump for SBM otherwise I would have bought one.

My system is a -6 so I stepped down right after the sender but it does not seem to cause any issues. I asked them directly about that, they said it was OK to do but just to do it right at the sender instead of somewhere else.

The main stumbling block using an off-the-shelf mechanical pump with higher output engines would be the line size since most are for 3/8 or less. If you can get away with a 3/8" line then it's fine but step up to a 1/2" and you're going to have to step down to the pump inlet which is probably not good. The Race Pump I referenced above has -8 inlet and outlet so in that regard it would be a better choice.

The Carter inlet and outlet sizes are NPT so you just use an adapter if you're using -AN fittings.

Also on the Carter pressures - before I put the regulator in line, it was 12 psi. Not kidding!