I agree on bulk remans. But if you've got a local rebuilder, its a different story provided good cores are available.

I'd go without A/C before using a Chinese copy/ripoff, personally

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OK, I'm all ears: Why uneasy? I haven't ever used a Seltec, but it seems they (either under that name or the "Diesel Kiki" name) have been used as OE in all kinds of industrial/commercial/agricultural heavy-duty service, with at least as good a service record as the Sankyo/Sanden units. Seems some people prefer the Sankyo/Sanden and others prefer the Diesel Kiki, along the lines of some preferring Holley and some preferring Carter carburetors. What puts you off about the DK compressors? It can't be the country of origin, given where your new Sanden SD was made!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

How about horsepower loss. I've heard the the V2 takes over 20HP to run some say as high as 38 wich sounds high to me but the sanden should be down in the single digits like 8HP. That alone pluss the wieght advantage is why I want to switch. Sometimes I use my A/C as a jake brake to slow me down it sucks so much power

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70 Valiant 225,super six
65 Dart More Door race car 225/4bbl 8 3/4 3:91
70 Dodge D100 Sweptline short box 225/4spd

Uhhh...no. Not even close. No way, no how. If they took anything even remotely close to this amount of power, they'd melt down into slag under the hood from the heat released by dissipating that much energy in that small a chunk of metal.

Axial-piston/swash-plate compressors (Sanden, Seltec, Frigidaire A6 and DA6, Nippondenso C171, and many others) actually tend to take a little more power to turn than crank-and-conrod compressors (Chrysler V2, Frigidaire R4, York, Tecumseh, and many others) because in a swash-plate compressor, there are more frictional junctions.

The advantages of swash-plate compressors is their packaging efficiency (small overall size for any given total displacement) and their evenness of torque to run. With a V2, York, or Tecumseh, you've got peaks and valleys in the torque required to turn the compressor through a full 360° revolution. Peaks when the pistons are going up, valleys when they're going down. This creates noise and vibration issues that are not impossible to solve, but are much more difficult than with compressors that have a higher-but-more-stable torque to turn through a full 360°. Brackets and belt drive setups can be less robust because of the reduced peakiness of the torque load. But that does not properly translate to the popular myth that the V2 (etc.) type compressors have these enormous, huge power demands that are way higher than with a Sanden (etc.) type compressor. It just ain't so.

(The Frigidaire R4 compressor manages to finesse-out a lot of the peakiness by using four pistons rather than two, which doubles the frequency of the peaks and valleys. It's an efficient compressor, but still has noise issues and happens not to be a very robust design...which is of course why GM installed so many of them on so many vehicles )

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一期一会
Too many people who were born on third base actually believe they've hit a triple.