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I cant think of any reason to use a hv pump unless you need extra oil to help keep the bearings cool in a steady rpm situation. We use em on irrigation engines that see 1800 for 24 hrs,but they have large capacity pans. The ole ZL-1 and L-88 engines had em but they also had bigger pans. Normally a std volume pump with a pressure spring will work fine especially with std capacity pan.
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