This is the worst engine I had own out of over 100 what I own. I have it rebuild @ Accurate engines with a dead piston, almost no compression piston # 8. Use to have 43-50 psi oil (cold start then warm up)pressure when I bring it IN, after rebuild I'm running @ 37 psi at 55mph. It use 23 qts of oil between oil changes @ 7000 miles a part. I use only full synthetic oil mix with duralube after rebuild but shortly I give up because become very expsnsive to keep this engine running. I look in forums, I try Mystery oil, lucas, all additives in the market with no results. Pay as lmost $6000 for repair, no I have a knock running what put more frustration to the bill. Shold buy a crate engine from the start. DO NOT WAIST YOUR $$ HERE !!!