yes the head is a pain in the behind I had a 86.5 and rebuilt the whole motor and the head was the funnest part to pull out from under the hood needed me and someone else on the other side to lift it. The sound is kind of like the when a motor deisels you hear that clack noise it is kind of like that it is a better way to describe the noise all together. The shop manual has no trouble shooting for a knock so I am kind of stuck. As for oil I am using Quaker state high mile 20w- 50 because of the fact it has leaking valve guides and it has 150000 miles on it so the oil is decent not like royal purple or anything or racing oil. my 86.5 never really had high opil pressure or anything. I just need to know if this is going to get expensive again like my 86.5 because I might have enough money to buy a different motor like a 1JZGTE 5spd just trying to make it cost effective so I can delegate funds towards it.
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