I'd just go the high pressure spring right off then adjust Hot Idle pressures with Oil viscosity if needed..
Finally sorted out the ticking lifters - new Melling 10296 oil pump with the standard pressure spring - also fitted a Setrab 625 oil cooler and a 185 Deg F Thermostat for the oil cooler - all the parts came from improvedracing.com in the USA. The temperature is rock solid at two needle widths above 1/4 on temp gauge. The oil pressure is never less than 200 kpa even when towing, on a 40+ degree day and when stuck in bumper to bumper holiday traffic. Woo Hoo! Been in now for about 2 years very solid and stable performance mod!
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