Lifters can be a big source of trouble!

Denny I beleive you on lifters for sure.I just worked on 2 bbf engines for a buddy.The first one was a iron headed cj 545 that had low oil pressure?After a little head scratching and digging we found that the new solid lifters were leaking inside the bodies.The next engine was a engine he had just picked up with drag car,the engine also a 500 inch 385 block had thrown a lifter and taken out the solid roller stick.The previous owner had replaced cam,lifters and replaced mains.After it was together it would only hit 40 psi cold then after a minute run time drop off to about 15-20?We did some digging and it appears they hand been sold 351w roller lifters?I had a good used set of Isky roller lifters and we stuck those in and now it runs at a consistent 75 psi?It is very important to check these new lifters with a pressure check with intake off as the quality seems to be lacking these days!The engine above may have a couple bad lifters or like Denny says the bores could be at fault! Just some food for thought! Steve