Why are these pistons so cheap on this site?

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They're speed pro. They're the same cheapies you can get at Advance Auto, Auto Zone, etc. They're good, just nothing fancy, and that's more than they cost in a set. Yes they come with pins, no, they don't come with rings..

Edit: The set I bought also came with the wire locks for floating pins, but if you're buying 360 pistons, they probably won't, since they never came stock floating-pin.
 
My KB pistons came with locks,and pins. I'm not too sure about Northern autoparts,never ordered from them,but have had several quotes for parts on the high side.
 
nothing wrong with those speed pro pistons...just a little heavier and a few thousands lower in bore then a kb107....

those speed pro is what mopar used in there crate short blocks and engines..

have ordered a few parts from northern...always showed up....

sometimes things over stocked and need to clear them out
 
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