i run 10w 30 in it i changed it and it still makes the sound.
it misses every now and then. i just bought a set of lifters and push rods im goin out here in like 30 mins to get all the gaskets i need to change my heads out and i got an extra set from my brother that are rebuilt with new valves. valve seals, cam ready valve springs, shaved, ported, and cleaned up zero miles on then and im doing the swap 2morow it'll take a good 4 or 5 hours but we have done it before with his mustang and now im putin new lifters push rods and new heads on my t bird and hopefully it will fix it and if not im changing the oil pump
thanks for the advise