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Very nice! I really like the green. Is that a Contemporary?

Yep both top and sideoilers have the relief valve in the rear of the block. Most are set to bleed off pressure at 55-65 psi with the pump recalibrated to bypass at 115-125 psi to prevent cold start...

10 psi per 1000 rpms is the rule of thumb. Pretty common for the sideoiler to have pressure in the 75 psi cold to 65 warm at all speeds if the high pressure pump was used. Cold the 390 in my Cougar...

I still think they might have coil bound from the first set of weaker springs or there is mismatched valve train components. This could have easily stress cracked the aluminum rockers so you might...

www.claysmithcams.com also very good for pushrods and other parts.

Well if "slightly" heavier springs were added it sounds like the first one's may have coil bound. Possible a pushrod is slightly bent. Even tho all top shelf parts were used they need to be matched...

Who rebuilt the engine and what kind of rocker assys were used? Stock adjustable, aftermarket rollers etc...? What heads are you using? Stock C5AE-F's? If the heads have been milled to death the oil...