10 lbs of oil pressure on engine break in..........

brian6pac said

I have had many 340's and none have had plugs behind the cam plate. I don't know when they started using them, at one time I was going to put them in because the owner wanted them in but the plug was so long that it would cover up the oil galley hole going to the right lifter galley from the front main, so long as the plate is flat you don't need them.

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I had an engine that had low oil pressure due to the two plugs not installed behind the camshaft thrust plate.. We proved it with a priming shaft and saw oil squirt 6 feet from behind the plate... It didn't squirt it all the time, one time it wouldn't then the next time it did...

I always install them since and I get 45-45 psi oil pressure at idle...