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They do this with vacuum pumps for race cars... yes, vacuum in the block is a good thing, and it actually provides more than "marginally greater" ring seals.
I'm not entirely sure how much vacuum they use, but you can get belt-driven vacuum pumps from Summit Racing and Jegs for the purpose.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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