Re: y block oil pressure
"will ADD 5-15 psi..."?? Could this be a misprint? Piping oil from the main galley to the rocker shafts will actually cause a drop in pressure. "
No misprint. I always pressurize rocker assemblies on a Y Block. The spillover system from the factory is: 1) an oil leak directly to the oiling system, and, 2) does a lousy job of oiling the rocker arms, as evidenced by scored up shafts on just about every y block torn down for rebuild, because there is very little if any oil pressure in the rocker shaft.
You can argue modern oils vs '60s oil if you want, but I routinely get 30-35 psi oil pressure hot on any Y blocks I rebuild.
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