Pinned the oil pressure gauge

[Cor66Vette]

Originally Posted by RevXtreme 1

Higher oil pressure equals less power as well. I like the pressure between 30 & 60. To thick of a weight is also a power robber unless the bearing tolerance are looser (we build the drag motors 5 thou looser than street motors) and then we run a slightly heavier oil.

In your opinion could 10w40 oil be the problem? and if/so would 10w30 or 5w30 make any difference?

[Cor66Vette]

My high oil pressure readings have lead me to inspect the by-pass valve. Perhaps what I noticed is of no consequence to the matter but I want to put it out here just in case.

OK- Here it goes!
1st picture shows the area where the by-pass plate gets installed. Notice the hole in the block.

[IMG][/IMG]

2nd picture highlights the by-pass in the plate. Also highlighted is an "X" stamped at the opposite end of the plate.

My question(s) ... Should the by-pass get positioned in a certain way? Should it be as close to the hole in the block as possible? When I removed it for cleaning/inspection the by-pass was at the opposite end of the hole in the block and the "X" was closer to the hole in the block.
Also, what I found of possible interest ... the by-pass plate's mounting bolts were different, which leads me to believe a previous owner was messin' with this set-up at one point.

[IMG][/IMG]

Thanks to all who have helped with input and information.