Jay Lestingi
It is amazing how little valve spring pressure is being run nowadays thanks to Spintron testing actually showing what is happening on the top end of the motor. I mean 160 on the seat and 600 over the nose is nothing for a 270 @0.050" and 0.800" lift cam! Not to mention the 1/2" thick wall pushrods (I know pushrod weight is supposedly inconsequential but it has to add SOME weight/rpm loss to the valvetrain)