I have a 83 pickup and it started knocking real bad the thing is it only knocks after you drive and for about 5 mins and get it warm. I cant really pin point were it is coming from it gets worse when you rev it and you can kinda get that mid point in throttle were the knocking gets super bad. I pulled the valve cover and the timing chain looks good. what should I look for the pin point were its coming from I hope its not a rod or main knock but if it is I can deal with that its a trail rig so it not like I cant get to work.
sounds like wrist pin knock. basically the piston wants to separate from the rod end. if it has good compression I'd pull it down and have new bushings installed in the rods and install new rod and main bearings because if the wrist pins are that bad so are the bearings
OR just run 20w50 Castrol GTX and dont try to rev to 6000 rpm.
