If your looking to save some money just change out the pressure relief spring in your stock pump to the Z/28 spring. This will give you standard volume but bump pressure up to 60-70 lbs. The stock sring is good to about 55 lbs and in my opinion that isn't enough if your spinning to 6500 rpm.
Just remember the rule of thumb.....10 lbs of hot oil pressure for every 1000 rpm.
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Gaetano Cosentino
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