I run a basic HV pump on my 493. I set my clearances a tad on the loose side as all the mains were about .003 and the rods in the .002 to .0025. I just looked close at my car friday as I took a 90 mile round trip and it runs about 30 psi when hot (195) at idle and about 70 PSI at 60 mph which is about 3200 rpm cruising down the road. I am using Valvoline 20W-50 VR1 racing oil though. Ron