I paid an experienced friend to both build and deal with the machine shop that was tasked with machining my 421.
He had already done several with the latest one-piece BOP Engineering seal and knocked it out of the park, he is the go-to guy in his Pontiac club for engine building.
150 miles later zero oil or coolant leaks.
We’ll see how it goes from here.
First picture installation of the crank and BOP seal by himself using an engine hoist. Second pic static testing of the main seal and oil pan sealing at the rear. Third pic on the run stand for break in and lastly my friend and his son unbolting the engine from the stand so I could bring it home.