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Discussion Starter #1
i just rebuilt my motor put bearings, rings, head, water pump on the car but have a noise i cant discrib it only does this once the car is hot like a hollow knock sound comes from under the car like it is in the crankcase.. I never heard it with the 10w30 but once i swap synthic oil in it does it now.. should i be conserned with this noise?

also have surges at idle motor tries to die. will being slightly out of time cause this? my timing wont line straight up be in the befor of it or little after. so my question is should i put it befor or after timing mark? done 6 spi motors none lined up purfect had same problem?
 
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