Lifter slow to pump..

I think I’ll see if I can pull that lifter through the casting hole and look at the bottom of it and see the nose of the cam lobe. If it looks good, I’ll put it back in. Check all my preloads and start driving it. I’ve had dirt late model engines run 20 minutes to leak check it. And hot lapped at 8800 rpms at 22 mins in and they lived. Not quite the same engine here. Just saying. I agree. Break the cam in and be careful driving it while shaking down the car. And then start having fun.