Not what you requested but an option would b to groove a primo set w a hacksaw blade then take down the slight burr on the edges w just the right grit, not rocket science just spreads the film. Seperate issue but I also externally oil the heads like Indy does horizontally thru the rear to/angle up to the #5 pedestal. that lets me elim the cam bearing massive oil leaks (reduce each cam bearing vertical feed to 1/16")