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As best I figure at least one lifter is hanging a valve open slightly, sometimes. Fresh oil or a short drive or long/hot enough on old oil and it goes back to rock steady 19" or so vacuum at idle no flutter.

This is my first roller cam aside form my 6.9 IDI and 7.3 IDI diesels, and first breakin with a roller cam. I used my normal breakin oil just in case, for extra zinc and phosphorus. Then switched to my usual oil for all vehicles, Rotella T6. I use Rotella T6 5w40 in all my motorcycles, boat...

15w50 might be a bit thick for tight bearing clearances and a HV pump. Don't have my notes in front of me but I think .001"-.0015" on mains and rods. I did some minor grinding/chamffering on the block to smooth transition of oil passages and drainback. Only extra pressure bleed is a very small...

Roller Ford 302, '97 block, Melling JB-2205 lifters, Comp 35-308-8 cam (specs below), AFR 165 heads, Scorpion roller rockers, Melling HV oil pump. Engine has ~4200 miles. Plenty of oil pressure, I believe over 30 at idle and 50+ at RPM. Duration at 050 inch Lift: 210 int./215 exhaust...