Just a quick question for all you oil people. I have recently rebuilt my 455 and I left it pretty well stock except 30 thou over pistons and a hv oil pump. I also put in hydraulic lifters too. After I warm it up I can hear the faintest tappet noise at around 2000rpm. I am wondering if the hv oil pump is the culprit, maybe starving the top end a little? Also I have speco gauges and I am getting a reading of around 70 for oil pressure when cruising down the highway? I know these gauges can be out but from what I read on other threads that is too high.

 

Unless you are building a ***** out race engine, stick with the stock pump.

 

Did you relace all the rockers and stands when you rebuilt it? Are they all tight? What oil are you running?

 

Stock cam? What's the oil pressure at idle hot? Cruising hot?