Hello, I have a oil pressure problem with my 409. I have no oil on ether side of the rockers. I primed it with the show car tool and it shows' 25 psi . It has a high volume pump with 20-50 wt oil. The short block was built by a shop that has done several 409s the rear cam baring is installed correctly. It has a hyd roller cam. I was a ase master tech for 30 years but this is my first 409 not sure where to start. Thanks for any help Mike.