Chasing down a tapping noise

Yes, unless you baby it... but you won't be able to resist LOL. And if you go with that duration, the RPM range will be moved up and that will put more strain on the springs to keep things under control. A step up in springs seems like a no-brainer to me. The 901-16 spring set that Comp lists are a bunch stiffer than the stock ones. I hope the exhaust valve don't recess into the heads too fast with the non-hardened seats..... ooops... .maybe a milder cam is in order?

OK on the heads; tnx.